Need help!!

My bd and I have split more than a year and a half ago, but he still thinks that there’s a chance that we can fix our relationship. I’ve told him we can’t. But he keeps insisting and tried to touch me inappropriately last time he saw our kid.

I’m scared that if I tell him he no longer can come to my house to see our son and that I don’t want anything to do with him, that he will retaliate and try to take my child away. He’s not a good parent, never had been. He’s not responsible, he keeps getting fired from his jobs… I don’t know what to do I’m scared.