just wanna say, that 2-3 nights a week at the bar, coming home tipsy and reeking of booze doesn't exactly sound like a 1 or 2 drinks max kind of thing. a person who has a drink or two over the course of an evening, has metabolized a lot of it and shouldn't be tipsy/drunk, nor should the smell of alcohol emanate from them by the time they get home.
the problem with co-habitation is that no one person gets to dictate the house rules. he is at least respectful of not drinking in the home. you are certainly entitled to ASK him not to drink at all, but he gets to say yes or no. it sounds like drinking is a big part of his social thing.....whether it's actually a problem is another story.
i guess you have to decide how much this bothers you.....if it's temporary and something that will be less bothersome over time, or if it's a BIG DEAL for you. leaving the house, going for a walk is fine....unless it's pouring down rain, just flat out dark and unsafe, or there's two feet of snow. meaning that isn't really a solution.
there was a suggestion above that maybe each having your own living space would allow you to continue the relationship without this extra layer of "stuff".