There is a therapy called Couples Behavioral Therapy that some psychologist will provide. It sounds successful from what I've read.
Basically, the couple enters marriage counseling together. A contract is written up and trust is developed between the couple. The contract states that each day the alcholic will be thankful for not drinking yesterday and agree to not drink in the next 24 hrs. The spouses role is to thank them for remaining alcohol free for the past day and express how positively it effects them and can also provide empathy for the difficulty the alcoholic spouse is having.
The alcoholic also agrees to AA a certain number of times/week.
If a relapse occurs or if the contract is broken more than twice than the therapist is called.
I just thought I'd throw that out there since he may be open to therapy and it does involve a supportive spouse.