It's usually recommended to ANYONE in recovery that they avoid dating/getting into a new relationship for at least the first year of sobriety. That advice is given for good reason--not only are relationships famous for leading to relapse, but relapses are hell on relationships.
If this guy still needs the structure of a SLE to stay sober, he has no business dating anyone.
Drinking with him is a bad idea, either way.
There isn't much you can do to "support" him. Probably the most helpful thing you could do is to tell him to give you a call when he's been sober for a year. If he doesn't get serious about his recovery he isn't going to be any good to either of you.