MB, try to let it go. You can't change him, only he can do that... no matter how much you loved / love him.
I've known life-time party alcoholics. The more that time goes on, the more destructive their lives get, the worse off their health and appearance get, the more they grasp to what they have left... the party. All of a sudden they turn around and realize they weren't living at all, just dying a slow death.
Sorry to hear about your ex, but it sounds like you made the right choice to make him your EX. Alcohol lies to us all, it's lying to him and creating a fake world that he sees as reality. Just be glad you're not a part of that destruction.