Do all agreements even switching occasional visitation plans in writing with signatures,try to never speak to him without a witness,stay in counseling,give him the rope he needs to hang himself.Keep yourself on the high road because trying to hurt him will hurt your child in the end.
God bless and I pray for strength for you and wisdom too:)
i no the feeling i going through the same
Lean on your loved ones, your family and friends for support. If you are the religious type you can pray. Best of luck to you. I'm sorry for your situation.