I'm sorry. It's your life. I can't tell you what to do. I just always want children to have 2 parents, and I think she is using your goodwill against you.
I once staged a push to get my H to move out. I was having an affair, but I wanted him to leave so I could say he abandoned us. He refused to go. It was a scene. But it passed. And we continued on.
I wish she would go see that pastor with you. I will pray for your sitch.