What to do if a guy cheats on his girlfriend with you?

Move forward and get rid of him. Because hes a cheat, once a cheat always a cheat. You deserve more

While the fun lasted, I would avoid him at all cost.. Even if you do love/care about him. If he cheated on his girlfriend with you, if you guys ever do become a thing then he's likely to do the same thing to you.

Understand that it may have been a 'one-night stand' and if you were hoping for a relationship, it may not happen. On the other hand, also understand that if he breaks up with her for you, you already know that future trust in your new relationship may always plague you with worry that if he cheated for you, he may cheat ON you. Either way, what is past can't be changed, but in the future, I would hope you've learned that it is not a good choice for you to date someone who has a steady girl already.

Leave him. And tell the girl. You would want someone to tell you, no? Also, if you knew he had a girlfriend, take responsibility for your part. But overall realize that he is wanting you to play second fiddle and the way you get him is the way you'll lose him.

I would not get I to a relationship with any guy that has a girlfriend, to me that's just asking for conflict. However if I was the one being cheated on, I would def be upset.

Leave that guy, that should be a huge red flag already. No matter what his excuses are, he should break it off with his girlfriend first because if he can do that to his girlfriend, there's no doubt he will do it to you

If you are the middle of the triangle, you need to cut it off quick with the guy, and for trust purposes, talk to his girlfriend. :)

You should probably not contact the guy anymore. Clearly he is not a good person because cheating shouldn't even be a thing... and if he did it to his girlfriend why wouldn't he do it to you as well.

Then he is just playing, if he was not sincere to his gf.. how you can think that he would be sincere with you? he doesn't deserve your time..you'd find far better than him. just be strong for yourself.. because girls are not things so anyone could use them.

Own up, no one is bad and no one deserves to feel second best. If you feel he can do that to her, what will he do to you? Don't get me wrong, some guys can be good and make mistakes but would it not make you wonder?

If you've found that out, try to tell him you're not comfortable with the relationship and you want to stop. He has no right to do anything you're not comfortable with.

With any cheating scenarios, it's never easy for any people involved, especially towards the person that's being cheated on. With that said, If your single then you don't need to worry about who your hooking up with. You control what you do not others, if a person cheats then that's on them. It's probably better to try and avoid relationship people then do so, but if you do then I don't think you have much to worry about and feel guilt over

Leave him and tell his girlfriend, if he betrayed her he will probably betray you too, never trust someone who betrays, even if they betray your enemies to you, you never know when they will turn round and betray you. If you saw them stab their friend in the back would you ever trust having them behind you with a knife in their hand?

do what you feeling should be done. every situation is different. you dont have to leave someone because they cheated but if you wanted to thats totally fine

I will try to understand the situation. Sometimes situation might not as simple as it appears before you!!

Well this happened to me some time ago, when I realised he was married, I met his wife and told her every single detail!

If you are allowing the cheating to take place, it's likely that there will be some drama and you will be involved. Hearts will be broken. To prevent this from happening, it may be best for the guy to express his feelings to his original girlfriend. This is only a suggestion. It may not be a great option for your situation, whatever that may be. I wish the best for all three of you! ♥

Tell him you are not willing to continue the relationship and tell him it is bad to cheat on someone that really loves you and cares for you and does everything for you

I would immediately broke things off, and tell the girlfriend what happened and how I didn't know he was involved with another person.

it is a difficult situation, and there can be two things that change the way to handle the situation, 1) did you know he had a girlfriend? if yes then maybe you need to also ask yourself what caused you to have the desire to cheat with him? and maybe think if you might need to focus on personal growth and maybe speak with someone about anything that comes up emotionally for you. 2) if you did not know then try to put yourself in the girlfriends shoes and think what you might like to happen if you were her? and also know if you did not know then you are not to blame and you also might feel betrayed or hurt and upset.