Long story I guess. I thought it would be shorter when I started typing it. My problem and cliffs are bolded at the bottom. My friend liked this girl, she liked him. They talked for a while but never did anything. No dates, no kissing, nothing.. just hung out a few times (they work together). Six months go by, nothing. She invites me to her party and we hook up. A few weeks go by and we went out a few times and I was getting ready to turn things into a relationship. I asked my friend how he felt about things first to make sure he still wasn't hung up on her and he insisted it was cool. A week goes by and she starts ignoring my calls and shit out of the blue so I find out that he developed interest in her again and then the next thing I know they're officially dating. I was kind of pissed for a few days but didn't care much because she wasn't an awesome girl and I had only been talking to her for about two weeks. My friend dates her for like two months and then they break up because she's talkin about marriage and shit. He starts talking to another girl (girl B) and they end up dating, but within like 10 days they break up because he's "still in love with the other girl". He goes back to dating girl A. We go on a snowboarding trip (that I had already planned and paid for) so girl B comes along, since the funds were already taken. The two get along fine but there are some very awkward moments. Girl B spent the whole night trying to kiss my friend and get with him but he wouldn't do anything with her because of his girlfriend and because Girl B was drunk. He "didn't want to do anything with because she was drunk". He ended up making out with her a little bit (he was sober) and they cuddled off and on throughout the night. She kept trying to get him to fuck her, but he kept denying her. I started drinking a little bit more (I definitely was aware of what I was doing, just sociable) and I started flirting with her big time. By the end of the night we had made out quite a bit, I fingered her, and she ended up sleeping in my bed. My buddy came in and saw us sleeping together but never said anything to me. We got snowed in the next day and she never really said anything to me (kind of pretended like it didn't happen but there was no awkward tension between us by any means). We drank again the next night and I didn't do anything with her except flirt a bit and cuddle for about 5 minutes while my friend was in the other room. She confessed to my best friend that she really liked what she did with me but was kind of embarrassed because this was the first time I had hung out with her and she didn't know me that well. She spent the whole second night trying to fuck my friend again but he denied her again.. Once again, I didn't make any more moves on her because I didn't want to cause any bad blood. I saw my friend today at the mall when we met up to do some christmas shopping and he was with his girlfriend and acted like nothing had happened with girl B at all. He never said anything to me about being jealous (but he told my best friend that he was jealous when he saw her sleeping with me) and he acted like he never did anything with girl B up in the snow. Cliffs: My friend lied to me about his feelings for a girl I was interested in and started dating her without telling me. He broke up with her, and started dating a different girl. He broke up with that girl to get back with his original girlfriend so I made a few moves on his ex-girlfriend while we were on a snowboarding trip. Neither he or I said anything to each other about it, but we both know it happened. My problem: Is there really any reason for me to bring it up to him or feel bad about what I did? He technically cheated on his girlfriend while we were up in the snow, and the girl that I made the moves on was technically single. I kind of like this girl but because of the friendship situation don't think I would ever pursue anything just out of respect for my friend. I'm just not sure if I should bring it up to him and talk about it to clear any possible tension between us.