She cheated, and I'm getting all the crap Options

[MrStrife]

So I met this pretty little thing not too long ago and during the initial getting to know each other phase (what do you like to do and stuff), her bf interrupts with a phone call. She suddenly hands me the phone and he talks to me with not too pleasant tone demanding who I was and what I was doing talking to his girl. I simply apologized for not knowing and told him we just met. After that I simply ignored the chick until months later I decided to talk to her out of pure boredom, which in retrospect seemed the most opportune moment. They apparently broken up and I played my game pretty good to the point she was dying to go out with moi. We couldn't get enough of each other and it was all gravy until the other guy got locked up and for some mind-boggling reason she went back to him. This fact however didn't stop her from talking to me with the same intensity from before and when I asked about the other guy, she just said, "So what? He's in jail." So I just shrugged it off and made plans that turned one night tremendously magical where all our troubles went out the door. After I just walked around with this stupid smile stuck on my face without a care. It was only one night at my friends party I got really drunk and called her (never calling girls when I'm drunk again) just to see what's good between me and her, only to get kicked to the curb. SHE STILL WANTS TO BE WITH HIM! I just totally dropped it and left her crying. So I'm thinking she's going to to come clean with her stupid hypocritical conscience and her bf is going to kill me whenever he gets out from doing his time from (guess what?) beating some kid to a bloody pulp. FML

Damn. I have no idea where to go from here. Used and abused it seems I am. What do you think is the best course of action for me?