Last night we had a serious fight, the first one.?

I don't really have anyone to turn to about this. I know what i am doing is wrong, I know I am going to get hurt but... I had a pretty hard life. Got kicked out when I was a kid, never really had a place to go, lots of shitty boyfriends, no one really in my life I can depend on. I met my boyfriend about 6 months ago. He doesn't just have a reputation, but a serious "rock and roll" type. A new friend came over the other night and we were drinking, they were having guy talk about his "awesome" past life. I left it go, guys do that stupid stuff, makes em feel manly to talk about sluts and stuff. We decided to all go to the bar. He said hi to a girl he knew when we first got there, then we played pool for a bit. As I was playing he snuck off to the girl and chatted real close to her all night. Left me standing in the corner and never bought me a drink or acknowledged me. By the time we left he was completely trashed, I was fine, lol he didnt buy me a drink... When we got home, I questioned him. Asked him who that girl was and why he left me like that. He punched me in the mouth and threw one of my heels through the window. He jumped on top of me and started kicking and punching me, his new friend hit him with one of the empty bottles. I am trying to get through school so I can get a better life. I haven't much of a choice to go or stay or not. I'm not unraveling my life again into chaos, Ii can't handle too much more. Even here though, there is chaos in my life. Of course he apologized, said hes never done that before. As far as I know he hasn't. He said he was just really really drunk. I'm not sure what to do. Whether I should stay and if I go, there's nowhere I can go really. Rough question I know. I also wonder if anyone understands love like that and if maybe it's ok.