Proceed with caution, eyes wide open.
If it quacks like a duck and walks like a duck, then it's a duck. I hope he's working a program or that makes him a dry drunk. As another person here said, maybe he is a problem drinker but who needs that mixed with untreated depression. Idk. Follow your gut.
If it were me, I'd like to think I could do better and I would throw him back in the pond. Glass half-full.
Peace,
Jen