My boyfriend changes completely when drinking alcohol?

It doesn't matter if you two have been together for 3 days or three years. What he did should not be tolerated. Obviously he shouldn't be drinking if he acts violent. He attacked you and broke things. He is using being drunk as an excuse to abuse you. Alcohol is a nasty thing to some peolpe. It is ok in moderation like a social drink every now and then. If someone cannot controll their own behavior, that is a bad sign. You should leave him. I know it is hard because you have been with him for a while. Once he hits you , he wont stop. Like you said, he is much bigger than you. What if he kills you next time? It doesn't matter if he is sorry. He never should have done it. He is a loser. Get rid of him. Mabey he will not do that to the next person he is with, because he will realize this is unacceptable. You are too good for him.