As someone whose ex was an alcoholic and from attending meetings in trying to learn to cope with his disease, if he had quit drinking for 10 years, he'd still be considered an alcoholic but in recovery. It never ends. Unfortunately my ex chose not to do anything about his drinking and his behaviour deteriorated into abuse.
There are recovering alcoholics that are able to be around people that drink in moderation, ie out to dinner and have the other person have a drink of wine with dinner etc. Unfortunately, being the only sober one amoung a group of drunk people is not fun, I've been there and perhaps this is what he doesn't want to do. The only thing you could do is outright ask him if it would bother him if you had the odd drink.