(((NEG)))
It must really tug on your heart to see him reduced to incomprehensible crying...It would me, too. Personally, I never experienced AH crying and begging me to stay in the marriage or in even in our home.
You owe no one nothing. His motivation has got to come from deep within himself. You can be supportive of his seeking sobriety and no promises of any kind are needed.
The only reason he needs to get sober is because he wants a better life for himself.
Be good to you, my friend.
~GHM