Alcohol Behavior

I have been dating this guy for nine months now and at first eveything was fine we went to bars and nothing went wrong. Then about two months into it that's when it all started he got drunk and just started being really mean to me we was calling me names telling me I was no good. Well I thought maybe he was just in a bad mood that night then it started to happen more and more offten and stated to get hands on. The worst thing about it is I can tell when It's going to be a good night and when it's going to be a bad night his personality changes completly, and most of the time he says he blacked out but is really sorry the next day!!!! So far I have had several brusis and at least one cracked rib. I think he should quit drinking all together but he thinks he can just cut back. I don't know how to talk to him about it anymore when he talks about going out and "drinking a lot" I go from happy to wanting to cry just at the thought of him drinking and when he see's me upset about it he says "i'm letting myself get upset" but how can I not when he has promiesd me so many times he was going to do good then it happens all over again. So is it my fault I fell this way should I just back off or dose he have a problem?