see,i think your situation is some what similar to mine.my ex girlfriend did something once,then made promises that she wont do that ever again,and then did that again and again.I forgave her with a hope that she wont do that again,but she did.ultimately I found my self as a victim of the love i had for her.there is nothing worse then seeing your self being humiliated for no reasons.Its better being alone.rather than being abused on the name of love.now when I am not with my ex girlfriend,i often ask myself a question..”how did i let that happen to me..??

you have written that your guy has abused you 4 times in the past 6 months and he has been drinking despite of repeated promises.so now it is the time for you to decide,but before taking any decision just evaluate every thing,whether there is any scope/hope of improvement??because post break up consequences are very hard to deal with.and even if you stay with him…will you be able to accept him with all those things?will you be able to love him and,respect him after being treated like this?..so think very carefully and just decide for your self.
Tc