((((misslib)))
I wish I cold tell you do this or that and it will break his cycle of use. I think cupicake spelled it out pretty good though. It is his battle to win or loose not yours and the more involved you get in his stuff the crazier you will become.
Possibly it could help for you to back away from him and let him take his own medicine instead of expecting you to control his use. That is a well laid trap that is sure to make you nuts.
Give him space and yourself space so you can think clearly about what you are committed to.