"I thought you told her no spending time with the OM with the kids. Did you ever enforce that boundary? Did the church ever confront her like they said they would?"
I am having trouble with enforcing boundaries, too.
I don't know, man, hang in there as long as you can. Like you said, we will know when enough is enough. I am getting very close to that place. It won't mean it's over, just that detachment is complete and we are okay with whatever the outcome. I never thought I would get there. I never thought I would accept a lot of things. We grow, learn and accept that we can't change THEM, only our selves.
BTW, on a subject close to my heart, how are the kids? I hope they are well. As well as can be expected, anyway. I really do hope and pray for you and your kids.