My DP is a functioning alcoholic imo, in his he just likes a drink and can stop at any time, though won't as it's the only thing to live for. We have a two month old daughter but she seemingly doesn't count.
As time had gone on his tolerance to alcohol had dropped. He's fine on wine and beer, but can no longer handle whisky, his drink of choice. I know when he's been drinking it - he becomes belligerent, forgetful (and thus tells me the same thing time and again) and can get downright nasty in deeds and words. I had a few really nice evenings with him last week where he had no whisky but have gone to bed close to tears the last three nights. I dread the evenings when he's been drinking whisky as I don't know what mid he'll be in.
I asked a little while ago whether he had whisky for tonight and he said no, but wanted to know why I was asking, so I told him. His reply was that this doesn't happen as he doesn't talk to me when drinking, and that I'm making it up. He probably believes it, too, for, as I said, he becomes forgetful.
Just wanted to get that out. There's not advice to be given, really, other than to LTB and I'm not there yet.