Don't analyze it, he hits you because he is an abuser not because he's an alcoholic. The next time he hits you (there will be a next time unless you go), he could very well kill you. It happens fairly often enough that it's no longer shocking to see women killed by their partners. Listen to the good folks here. Go, call the hotlines who are trained and can go into professional detail on how to leave (logistics).
This is more a DV problem than how to deal with an addict.