I commend you for considering it. That's totally your call and I doubt anyone here is gonna make any predictions about his mental state.
Just wonder how I would feel if I gave someone my liver and they started drinking again?
I wonder how I'd feel if I gave someone my liver and they totally turned their life around and (hopefully) inspired others to stop drinking?
Tough, tough questions. HP will guide you. (((Hugs))) for all you are going through.