As a recovering alcoholic ( 4yrs. yesterday
) I understand his behavior.
I was, in a way, slowly committing suicide...and there was really nothing anyone could do to stop it until I decided to.
I would highly suggest an Al-Anon meeting, at least try going to 4-5 if you don't feel comfortable at first...you will gain perspective and understanding on your role in this and whether or not you care to continue on in this relationship.
Alcoholism IS a family disease, everyone suffers.
You've done the right thing reaching out, please continue to do so.
Best of luck to you and your AH.