I don't know that telling him would do anything positive. I eventually told my AH that I was frequenting a support site - mainly because as we talked about things, he'd say that it sounded like I knew what I was talking about and he was curious how that had come to be. I don't recall ever specifically telling him that I was on this site, but I think I did suggest that he find an online support group as part of his healing.
Also...if he's in denial, and/or if he gets belligerent when he's drunk, then telling him almost certainly will result in conflict. The choice is yours, but I say follow your gut. If he's in a mood, back off - nothing good will come of divulging that you're seeking support; if you feel like he's in a good place, then maybe it can be the start of a good conversation.