Focus on how bad life was with him, what it's like being with a drunk. You can't trust or believe him. Then ask yourself if this is what you want for your life? Because he ISN'T going to change.
One of my favorite lines is from Thelma & Louise: "Thelma, you get what you settle for."
I don't know you but you can do a lot better than this. And ask yourself: is it love or is it need?
Al-anon is terrific.