I need advice on what i should i do about my freind?

I've had this freind since we were in middle school were like brothers. Well the other night he hit me because I was acting drunk and stupid and pushed him over the edge he was drinking too. This has happened more than once and other people have wanted to beat me up for it too. I'm really a like able guy its just when the booze and pills come into play I'm a total different person and everyone hates that guy but likes me sober. It always endswith me apologizing the next day and we forgive and move on. Also I never fight back because I'm so messed up and can't defend myself I don't even remember what hapened I just wa ke up with a black eye and know I messed up. After its all over I totally understand why I got hit and feel like I deserve it. I told someone about this and they told me it isn't right and that if he was a real freind he would have told me to leave and he started to use an example of a husband and wife in an abusive relationship regardless of who hits who itt isn't right and they shouldn't be around eachother. That got me thinking. Now I know I have a problem and I need help but does my closest freind have the right to punch me just because he feels insecure? I honestly feel like if those other people weren't there he would of handled it differently. Is he wrong for hitting me? And am I stupid for continuing to be freinds with him because he thinks he can just beat on me when he wantss?