If he works recovery, he'll end up addressing these things:
4. Made a searching and fearless moral inventory of ourselves.
5. Admitted to God, to ourselves, and to another human being the exact nature of our wrongs.
6. Were entirely ready to have God remove all these defects of character.
7. Humbly asked Him to remove our shortcomings.
8. Made a list of all persons we had harmed, and became willing to make amends to them all.
9. Made direct amends to such people wherever possible, except when to do so would injure them or others.
Those items are from the 12 steps.
This affair is a byproduct of a character defect. If he gets sober and works the steps, your relationship won't stand a chance.