Apologies if I have missed it, but has OP told us he doesn't have hobbies or friends?
It's possible to have both. Indeed, some people pursue their hobbies/and or meet friends, in the pub! There are pub cricket teams, give aside football teams etc.....
OP, as you state, I don't think the fact that he likes to spend time down the pub is any kind of problem - if we still had a nice local pub and it wasn't too expensive I would do this too - pubs are often at the heart of a community!
Daily alcohol drinking, however, is a possible concern. (Are you sure he isn't have zero alcohol beer on some of these occasions? It's in many pubs on draft now and becoming much more popular).
Because he is, from the sounds of it, only having fairly moderate amounts, he may not believe himself to have any kind of issues around alcohol. It's a common misconception that people with addiction issues are stumbling around pissed constantly having gin for breakfast..... Almost none of them are.....
My husband and I are now both sober and have been for a few years. We had started drinking on an almost daily basis, not generally to massive excess, but it was something that crept up on us..... I probably had more of an issue with it than him, to be honest, but he quit with me as it makes it much, much easier....
People on here like to say that people with alcohol issues never get sober, will always lie to you, etc etc. Quite patently that is not the case, as it is not possible to generalise like this.
If you really like the guy, I would mention it, see if he knows how much he is drinking or would consider keeping a track of it, consider building in at least a couple of booze free days a week. It might be something he has been worrying about, and you may find he is relieved to talk about it. If it did turn out he is worrying about it, and would like to try to go completely sober, is that something you feel you could commit to joining him in?