I have been thinking lots lately about what makes somebody an alcoholic. It''s not just about somebody in a gutter at 10am.
The AA web site says this:- "If you repeatedly drink more than you intend or want to, or if you get into trouble when you drink you may be an alcoholic. Only you can decide. No one in AA will tell you whether you are or not."
I'd say you thinking about leaving constitutes getting in to trouble. So yes, he may be an alcoholic.
I asked my DH to move out a month ago. He never got to the stage of passing out, but regularly drank a bottle of wine a night and spirits a few times a week. The problem for him was not so much the volume he consumed, but the effect it had on his personality. Some people are just really badly affected by it and become total dicks. My Dh is one, and sounds as if yours might be too.
The social thing I totally get. Toe curling, skin crawling stuff. I also get the feeling that they are a different person. That is absolutely what is happening. The alcohol is changing his personality, and not for the better!
Alcohol makes my DH depressed, anxious, needy, aggressive, verbally abusive. Things were escalating. It was becoming more difficult to keep things from our DD, who is 3. I am heart broken, but so relieved we have separated.
He hopes separation is temporary. I don't know what I think tbh. Some days I can see us getting back together 1 year or so down the line.
Some days not. It's hard. But not as hard as living with him!
I also understand what you say about him being a good Dad. Some people will say that if, for example, you are an alcoholic, you cannot also be a good Dad. I'm not sure it's that clear cut (for me, anyway). I would say my DH is a good Dad. Brilliant, in fact. He is also an alcoholic. The shit behavioural stuff when drunk is directed at me, not our DD (thank goodness, or i'd have left long ago). I know the theory goes that if he is shit to me, he can't be a good Dad, but again I just don't think it's always that black and white.
What is your financial situation? What ages are your DC?
Could you think about a temporary separation pending rehab. or AA and counselling, etc? I tried to suggest that to my DH 6 months ago and he didn't agree it would help. It is difficult to explain to the outside world, but for us we could have come up with a reasonable explanation (DH works away a lot). We are past that now, but it might be worth considering. That said, once the trust has gone, i'm not sure it's possible to get it back - but I may be wrong about that. I sort of hope I am.
It's shit but you probably do have to consider your options pretty seriously. If I had stayed with my DH, things would be just the same. Likely even worse.
Good luck OP. Your DC need you to be a tower of strength here.