Slightly in contrast to what root says, I found that when my parents separated it was an immense relief - the tension that you could have cut with a knife evaporated. However, both my parents worked well together to parent us to the best of their abilities, and my sister and I always came first. They did not move far apart so we always saw both our parents.
I do agree, however, that you need to consider this more carefully and not react in a knee jerk way.
I also was in a M where I was the one not showing affection. Over time you can show that this is not the case. The fact that your H is drinking etc makes me think that he is confused and things are not as cut and dried as he says. I found that each of us taking culpability for our own actions and admitting then to one another made a HUGE difference.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength