I am so sorry for your hurt. I hope you’ll do some reading of other stories here so you can see how common this is...everything’s “fine,” or at least that’s how it’s described, but then they ghost or dump or both.
It isn’t you. It never was. if you take a step back, he was always keeping your relationship very compartmentalized...only one day a week? Yes, the meetings, fine, but why couldn’t you have been included sometimes in those two “family” days?
He said he never had a serious relationship at age 41? That’s worrisome, yes?
Sometimes the alcoholism becomes a distraction or a way to deflect...”I can’t do that, I’m in recovery.” “Don’t make any demands of me, I’m in recovery.” It’s a distancing tactic with some people.
I hope you can just work toward accepting that he has ended the relationship and focus on being gentle with yourself while you heal. Breakups suck...but there is life on the other side, I promise.
Sending you a hug.