So sorry to read what you are going through. Sadly it is typical of alcoholic behaviours. I relate him wanting, on paper, the fairy tale life but then as soon as it gets in the way of the addiction, the addiction is going to win every time.
My A father did similar. He wanted the accessories of a wife and children. Its seems to be about "show" and how it looks from the outside. I know growing up, outside appearances were very different from the reality in my home.
I found it a comfort to read in depth and realise that none of the above was personal to me, it was an A doing what A's do.
I found Al-anon a great help. Sending best wishes to you and your baby.