I Need Help

So last year I went to prom with this girl I didn't really know
and between her asking me to prom and prom she slept with another guy who had a girlfriend, I didn't really know him or his girlfriend very well but they stayed together despite everyone finding out. So since this happened I've become good friends with his girlfriend who he has cheated on many times
If this wasn't already complicated enough I'm starting to have feelings for her and have no idea what to do about it
Oh yeah and I also dated another girl he cheated n her with
Please give me some advice
JohnnySmithy JohnnySmithy
18-21, M
Dec 12, 2012