I am struggling to deal with my partners sober/drunk self

It’s the typical story—he drinks, gets mean, and says hurtful things. The next morning, he feels guilty and is the nicest person ever. I find it so difficult to process this. I know that his drunk self and sober self are both “the real him”, but I have to be honest: if someone without a drinking problem spoke to me like that, I would have ended the relationship a long time ago.