<human>: Hi, RA. My girlfriend cheated on me, and I'm furious and really hurt.

We aren't completely serious (because I plan to go back to my country eventually), but she says she loves me all the time. She's Chinese and we both live in a big city.

On Saturday she met a guy from a web site that she says is friendship oriented, not dating. They met once and were cordial. They met later that night (in his apartment, which she claims is because she felt ill that day). After promising there was no pressure and they were just going to talk, and he started to seduce her. They didn't do much--he kissed her a few times (cheek, lips, ear) and she kissed him back a few times before she said stop and resisted. They had a talk, and then he continued to hit on her and try to make her horny. She said she wanted to leave and asked him to walk her home.

She told me about some of this after we got drunk together, but then later while comforting me, told me that she hadn't kissed me, he had only kissed her. I foolishly went into a long rant about the standards of relationships where I'm from, and how it's her responsibility to get herself out of a situation like that. But she was really much more complicit. She actually convinced me she didn't know it was wrong.

I'm alternating between being furious and depressed. I feel betrayed for more reason than one--being monogamous is difficult for me.

She said she loves me and doesn't want an open relationship. I've been so upset with her for the past 24 hours that I can tell she's getting fed up with it.

I don't want to break up with her, because things were pretty good (I like her, the sex was good, she speaks English, and is really attractive.) At the same time, I didn't want to marry her. Can I just cheat on her and call it even? I'm not sure that would make me feel better. What can I do? I hurt. The thought of breaking up with her and having lots of sex (even paid for) doesn't make me feel better.

Can you condense the text into a few key points?
<bot>: Girlfriend kissed a guy a few times then stopped. Later lied to me about it. Came clean when I pressured her. What can I do?