I replied to another thread but they only care about there drug of choice. Cocaine is an awful drug.
Things will get better. I allowed my ex husband to abuse me for 16 months before I went no contact. He started to back away as he found someone else. But no contact will keep you sane for a while.
Communication for your child should be civil if you can just ignore the bits where he is reducing your self confidence.. you are worth more and deserve more.
Things will get better … time heals and you will feel
Peace