I'm going to sound heartless, but what he does is on him, not you. It's not your problem. He has created a black hole for himself by not even trying to get better. You can't fix him or help him at this point.

Save yourself and get out of this relationship. Can you really spend another day in this hell? Can you imagine how free you will feel without his abuse? Please leave.

Also, there is a fine line between suicide and murder. Violence is violence and you are in danger.