You need to offer motivating phrases to your H like this :
"I have every confidence in the world you CAN be a great husband again, and I would love to see that. I just don't know if you are WILLING to be honest and do the work when its so easy to run away."
"I believe you can, but you need to do the work."
"We CAN save this marriage, its a choice the TWO of us make, no one else.. we can make this thing turn out great or not.. its all OUR decision"
And seriously it is.. its just TWO people, its not two whole countries at war here.. its just TWO PEOPLE who need to put up the white flags and put the knives away and declare a peace...
If whole countries can end a war the two of you can certainly do it in one suburban household.. its NOT THAT HARD...
If you speak positive and offer him hope, he will feed off that and feel hopeful again, I promise.
But he needs one or MORE people WATCHING him for falling off the wagon... you can't police him.. it just does damage... you know what I mean?