<human>: Could you distill the essence of the text into 1-3 sentences?

I'll try to keep this brief. The other night one of my best friends threw a party at his house. For the last month or so he has been seeing this girl, but they aren't technically in an exclusive relationship. I had never met her before the party, and I wanted to get to know my friend's new girl, so I struck up a conversation. Next thing I know, she's sitting on my lap and I'm mixing drinks for her. She's all over me. My friend sees this and doesn't really react at all. He is drifting around the party and when he isn't looking she keeps kissing me. I knew it was wrong, and I felt bad about it. But I was drunk as hell, and I haven't had female attention like that in over a year - it just felt so good I couldn't bring myself to make her stop. After a while some other friends pull me aside and tell me to knock it off. After that I was ashamed enough to keep her away from me.

Other details:

- She kept telling me that she's seeing another guy in addition to my friend

- The guy she's dating never reacted during all this, and continued to smile and joke around with me even while the girl was sitting on my lap

- I haven't seen him again yet, but I plan on profusely apologizing and begging forgiveness. He's one of my closest friends and I really don't want to ruin that over a drunken mistake

- The girl in question is really, really attractive, and even though I'm not going to let this happen again, a strong temptation will always be there. And (I'm ashamed to admit this) there's an evil part of me hoping they will break up so I can grab her

If you actually read all that, thank you.
<bot>: Got wasted, kissed a girl that my close friend is dating. She's super hot, I feel terrible, how do I handle this?