Slept with someone with a girlfriend. What should I do?

Anyone want to consider he might actually be in an open relationship? If the girl's German as in she lives in Germany and so they have an ldr it's a bit more understandable that they'd have an open relationship, it would also help explain why despite hooking up a few times he's more interested in sex than anything more relationship like. That said it's pretty odd that every time you were drunk and he wasn't.

I just see people sticking up for you, and i don't like it. No, he wasn't in the right of course, he's a dickhead and will deserve whatever happens to him. However, I just don't like how everyone seems to really ignore your involvement in it. You knew there was someone else and did it anyway. The fact that he said 'get a taxi home' speaks to his character a lot. However, the fact that you had an out, you didn't have to have sex with him, but you did. So, if you feel bad, in all honesty, you deserve it.

Yeah, she's said she isn't innocent in it all either and is seeking advice.

So this was months ago now but I still feel super bad about it but please hear me out.

We we started talking and we met on a night out and I didn't realise he had a girlfriend but his friend did keep talking about a German girl. I went back to his and he kissed me, he made the first move. I went home and nothing else happened. We spoke some more and I thought this guy genuinely liked me. Then I met him after a night out when I was drunk and he was sober. Yet again he made a love on me and more things happen. He mentioned a girlfriend but said it was an open relationship. I knew the next day that I shouldn't have went anywhere near him if there was another girl in the picture. He didn't speak much after the second time we met and it upset me. I did really like this guy. So a few weeks later I saw him again and went back to his. I didn't realy want to sleep with him when he tried to have sex with me and I said 'we can't have sex' to which he replied 'get a taxi home the' so I was stupid and we did and we both said it can't happen again. I always wanted to meet him so I feel pretty bad about it. I know it wasn't just his fault but he made a move on me when he could have told me to go home. I am not saying I'm innocent. But now I keep thinking about this other girl as he still messages me asking to meet but I say no. I asked if he was in a serious relationship and if he had cheated on someone with me but he said not to worry about it and that he can't label their relationship and that I haven't done anything wrong.

I don't like him anymore, but I feel guilty for this other girl. What should I do? He did tell me it was open and every time I was drunk and he wasn't.