This is tough I have a somewhat similar situation. Our HCBM was insistent on meeting me if she knew I was going to be alone with the kids. It wasn’t in the parenting plan that I was to meet her but I did it anyway. We don’t have a relationship at all and to be honest I don’t want one with her because she’s such an awful person. She treats my boyfriend like shit it’s a she can do things but he can’t. Well she started dating someone and was obsessed with getting them to meet it’s died off they did last Wednesday but she she has become different since getting into the relationship.
If you ever need someone to talk to dm been through a similar situation