Separating from husband

Looking for advice from those who have split from their husbands with kids involved.

I've decided to leave my husband. He cheated on me and I've tried really hard to get past it and move on, however, he has turned into a really nasty and horrible person. Neither of us are happy and there's definitely no love left.

We currently have an 11 month old together and I'm nearly 7 months pregnant with our next child.

I want our split to be as amicable as possible and for our children to still maintain a good relationship with their dad. Any advice on what did/didn't work for you when separating?

I also don't really want him present for the birth of our next child, as he would not be a support and would only serve to stress me out. Is this completely selfish and unreasonable?