Dear Liz, from my experience with alcoholics---they resent the h*** out of someone else hovering over their recovery. I am in agreement with most everyone else that keeping a hand-off policy is the safest (and most productive) way to go.
After all, you know that you can't control another person, anyway. If you get involved with his recovery then you can get sucked into becoming his sobriety policeman.
Watch his actions. That will tell the story.
dandylion