Found Out the Person You're Dating Is Married?
Entry No. 085 ·
By The IF Team
If you have just found out he is married (or she is), or that the person you are dating has a girlfriend or boyfriend they never mentioned, start here: it is not your fault, and you do not owe them a hearing. You were lied to, and lying is wrong. The steps that protect you are simple, even if nothing else feels simple right now. End it clearly. Look after your health. Keep yourself safe if they react badly. Take your time deciding whether to tell their partner: that is a choice to make calmly, never in anger. And if part of you still cares for them, there is an honest way to hold that too.
This guide is for the person who did not know: who met someone on an app, at work or through friends, believed them, and has just seen the ring, the photo or the message that changes everything. If you knew from the start and are struggling to let go, our guide to loving a married man or woman is written for you.
Having feelings for someone who is taken is not wrong; hiding that you are taken is. IF is a dating app for everyone, single or in a relationship, and it is built on exactly that line: your status sits on your profile, no conversation can open while either of you is marked as in a relationship, and whatever you feel can still be said honestly, in a sealed IF that waits until you are both single.
Being lied to about being single is not your fault
The first thing many people feel is not anger but shame. How did I not see it? Perhaps there were signs: the weekends they were always busy, the flat you never saw, the phone kept face down on the table. But those only read as signs in hindsight. At the time they had ordinary explanations, because someone supplied them on purpose.
Deception works by borrowing your trust, and trusting the person you are dating is not naivety. It is how dating is meant to work. You did not agree to be anyone’s secret, and you are not “the other woman” or “the other man” in any sense that matters. You were deceived, just as their partner was. The shame belongs to the person who lied.
Expect the feelings to arrive out of order: humiliation, fury, grief, a strange urge to defend them, relief that at least you know, a fondness that will not leave on cue. All of it is normal.
End it cleanly, without a trial
You may want answers, and you are entitled to want them. But answers from someone who has been lying to you are unlikely to settle anything, and a short, clear ending is kinder to you than a long interrogation.
Something like: “I know you’re married. I’m not going to be part of this. Please don’t contact me again.” Say it once, then block them if you need to. If you work together, keep every exchange to work and in writing, and go to HR if they will not let it rest. You do not have to prove what you know, win the argument or hear their side.
You may also want them to know your feelings were real. You can tell them, but opening up now tends to reopen the door you are closing. You may be better off sending an IF: it holds the feeling, sealed until you are both single, so that if the timing ever lines up, you are there to show them it was real all along. If they are on IF, they may be told an IF is waiting, never who sent it or what it says, though they may guess. If they are not, an IF to their email address sends them one short invitation email; one to a phone number or Instagram handle sends nothing. When you end it, you may well be offered one of three stories.
“We’re separated”
Sometimes true. But a real separation rarely needs hiding: the partner knows, and there are usually outward signs, such as separate homes or legal steps. If they hid it from you, you are right to doubt the rest. If you believe it is genuine, dating someone who is separated but not divorced covers what to look for.
“It’s an open relationship”
Some relationships are open, honestly and by agreement. But an honest open relationship usually starts by telling the people you date. If this is news to you now, the problem is not the arrangement: you were never given the choice, and nothing obliges you to accept it after the fact.
“I’m going to leave them for you”
This one hurts most, because it offers you a future. People can change, but a promise made to keep you is not a plan. If they leave, let them do it alone, for their own reasons, and decide afterwards whether you still want them. If your feelings are real whatever they decide, an IF can hold them without being a promise or a prize: it opens only if they become single of their own accord while you are single too, and even then you get 24 hours to reveal it or let it lapse for good.
Look after your health, safety and money first
- Your health. Book a check-up if you have been intimate, even if you feel fine.
- Your safety. If they react badly or will not leave you alone, keep a record, block them and tell someone. If you ever feel in danger, contact your local emergency services.
- Your money. If they borrowed or asked for money, keep the records and lend nothing more; someone who lied about a marriage may have lied about why they needed it.
- Your privacy. Change any passwords they knew.
- Your people. Tell one friend you trust. A secret is heavier carried alone, and this one was never yours.
Should you tell his wife (or her husband)?
There is no single right answer, and good people come down on both sides. Some believe a partner deserves the truth; others, that it is not their truth to tell. What matters is deciding slowly, for the right reasons, with safety first. Before you do anything, ask yourself:
- Is anyone’s safety at risk? If you are unsure how the person who lied would react, telling could make things harder for everyone. Talk it through with someone you trust before you act.
- Why do I want to tell them? If the honest answer is to punish the person who lied, force a choice or win, wait until that feeling passes. The truth used as a weapon rarely goes the way anyone hopes.
- Is anyone’s health at risk? If you have been intimate, their partner may need to know for the sake of their own health.
- Can I accept any response? Their partner may thank you, disbelieve you, blame you or stay. You do not get to choose which.
- Do I already have a way to reach them? Do not go looking. Tracking down a stranger’s details to deliver news like this tends to frighten more than it helps.
If you decide to tell them
Do it once, privately and calmly. Stick to facts, not blame: that you did not know, that you found out, and that you have ended it. For example: “I’m sorry to contact you out of the blue. I was seeing your husband for a few months. He told me he was single, I recently found out he isn’t, and I’ve ended it. I thought you should know. I won’t contact you again unless you want me to.” Then step back. Never do it publicly, or as a threat or bargaining chip.
If you decide not to
That does not make you complicit. You ended something you never agreed to. If their partner’s health weighs on you, tell the person who lied, plainly, that their partner needs to know, and book a check-up yourself. If their partner contacts you first, you can answer honestly and briefly.
If your boyfriend has a girlfriend (or your girlfriend has a boyfriend)
Sometimes what you find is not a husband or wife but another girlfriend or boyfriend, who may believe they are the only one too. Everything above still holds, and two things change. If you had agreed to be exclusive, this was not only a lie about being single: you were cheated on, and you are allowed to grieve it as a betrayal rather than shrug it off as a misunderstanding. And the case for telling can be simpler, since there is often no shared home, children or marriage at stake, though safety still comes first.
If they find you first, or you piece it together, you may realise that neither of you is “the other one”: you were both lied to by the same person. Comparing notes can be a relief, but resist turning it into a joint confrontation or a public exposure. Each of you can end it in your own words, without an audience.
If you matched with someone who has a girlfriend or boyfriend
Dating apps make this easier to hide. As of September 2026, most mainstream apps ask what you are looking for rather than whether you are already with someone, and in one survey of 1,486 Tinder users, just over one in five said they had used the app while in a committed relationship.
If a match turns out to be partnered — they let it slip, or a friend recognises them — you do not need their explanation. Unmatch, and report the profile if it misrepresents them. If someone tells you upfront that their relationship is open, that is an honest conversation, and your decision. If they hid it until you were invested, it is not. And if someone is honest that they are taken and you like them anyway, that feeling is not wrong. IF allows no match or chat while either of you is in a relationship, but you can still say it in an IF and let it wait, sealed, for a better time.
When you still miss them
Knowing the truth does not switch the feelings off. You are grieving someone who, in part, never existed: the version of them who was single and all yours. That loss is real, even if few people around you treat it as a breakup. Let it be one. Being deceived can shake your trust much as being cheated on does, and our guide to dating after being cheated on covers rebuilding it without building walls.
If you notice yourself hoping they will choose you now that everything is out in the open, that is not foolish. You are facing a different question, and our guide to having feelings for someone who is taken sets out the honest options. Hope is allowed; what keeps it healthy is not living inside it. End what is happening now, say what you feel once, in an IF, and get on with your life while it waits.
Where IF fits
IF was built on the opposite of what happened to you: relationship status out in the open. Everyone chooses single or in a relationship when they sign up, and a status badge sits on every profile card. Two single people can Like each other, and an accepted Like opens a chat; while either is marked as in a relationship, there is no Like, no match and no chat. So hiding a partner on IF takes a deliberate lie, and lying about your status breaks IF’s Community Guidelines: you can Report any profile you can identify, and every report is reviewed within 24 hours. Status is self-declared and IF does not check it, so keep trusting actions over labels, but on IF the question is at least asked upfront.
IF also gives a feeling like yours somewhere honest to go. Whether it is for the person who lied or for someone open about being taken, you need not become anyone’s secret to say it. An IF is a private, sealed message of up to 250 characters that opens only when you are both single; once revealed, they see who you are and what you wrote, and choose whether to accept. You say it once, set it down and get on with your life, and the waiting is the IF’s job, not yours. If the timing ever lines up, it is already there.
IF never tells anyone who sent an IF, or what it says, before it is revealed, though people can still guess from context. Knowing that, the choice is yours. Your first IF is free. Saying how you feel takes a little emotional bravery, and after what you have been through, you have already shown plenty. Maybe an IF leads you to where you were meant to be all along.
Questions people ask
Is it my fault if I didn’t know he was married?
No. Responsibility for a lie sits with the person who told it. Trusting someone you are dating is not a mistake, and missing signs that were designed to be missed does not make you foolish.
Should I tell his wife I didn’t know?
If you decide to tell her, saying that you did not know is honest, and it may matter to her. But it is not, on its own, a reason to reach out. Put safety first, then weigh why you want to, whether her health is at risk, and whether you already have a way to reach her.
What if his wife contacts me?
Reply once, if you feel safe to, and keep it short and true: you did not know, you found out, and it is over. You do not have to defend yourself or absorb her anger, and you can stop replying whenever you choose. If her messages turn to threats, keep them and block her.
Why would a married man pretend to be single?
Reasons vary: wanting excitement without consequences, telling himself the marriage is already over, or a settled habit of deceiving. A reason can explain the lie; it never excuses it. It is also never about something you lacked, and the same holds when it is a married woman pretending to be single.
Should I wait for him to leave his wife?
Whether he leaves is his decision, made for his own reasons. Waiting is not foolish if what you feel is real; what keeps it healthy is waiting on your own terms rather than on his promises. End what is happening now, say how you feel once in an IF, and keep living your life. Right person, wrong time? Wait for them on IF.
How can you tell if someone is secretly married?
Often you cannot, and that is not a failing. Patterns worth noticing: they are unreachable at weekends and holidays, you have never been to their home or met their friends, and plans always happen on their terms. None of these is proof. Ask directly, and trust what they do over what they say, rather than going through their phone. On IF, everyone’s status sits on their profile from the day they join, though it is self-declared, so actions still count for more than labels. Our guide to telling whether someone is single goes further, including on dating apps.
You trusted someone, and that was never the part you got wrong. Keep trusting your heart: when the moment is wrong, whatever you feel, and for whomever, can still be said honestly in an IF that waits for the day your timing lines up.