<human>: Summarize the given text in a few sentences.

I've been going out with my girlfriend for just over a year now, and we've had absolutely no previous problems of this kind. Yesterday she was out of town with some friends, one of them being a roommate of mine, and they all got very drunk. 

This morning she called me up super hung-over, telling me she blacked out and remembers nothing. My girlfriend then called me again later, telling me that one of her friends told her of something that may have happened last night. The brother of my girlfriend's friend (who was out with them) had seen what he thought may have been my girlfriend and my roommate kissing on the dancefloor of a club. He then told his sister, who let my girlfriend know.

So this morning that's what she told me, that she has no memory of it but that she may have kissed my friend. My roommate also claims to have blacked out and doesn't remember much. EVERYONE who was there that I've spoken to either remembers nothing or don't trust their own drunken judgement. 

When she told me at first, I was shocked, but I attempted to put it out of my mind. But I can't get it out of my mind, the idea of them kissing makes me furious and upset. I don't know if I can trust her, but there's also a chance that it never happened and that I'm untrusting of her for something she hasn't done. I know she loves me very much, and that she's sorry if she has ended up kissing him. I just don't know what to think.
<bot>: Girlfriend of one year might have kissed my roommate, no way of knowing for sure due to all around drunkeness. Feeling upset and angry, but don't know what to do.