Although a former wife of an alcoholic, I am now in recovery for my own alcoholism.
Alcohol was my solution to living comfortably in the world. I'd often drink at just the wrong times. It wasn't that I had no feelings for others, but my self centeredness and my self loathing made drinking a viable option more than being present for others.
It sucked, but that was my delusional reality.
So sorry you are going through this. Until he wants to change and to recover, it won't necessarily happen just yet.
Sending you lots of love and hugs. heal well