I ended the ones that seemed to "pick sides" and kept the ones that still want to be friends. I don't have a lot of them since the ex tried to throw me under the bus with all of them...the true friends that could see thru his bullshit are still friends...the others are gone and it is probably for the best.
That's more or less what happened here. He told a bunch of half truths and lies. Called me money hungry, implied I was terminating my pregnancy (obviously I didn't), accused me of cheating, tried to enlist help in getting custody...
I kept a few friends, but I have one I think is spying. Should I trust my instincts and end the friendship? He's not exactly my favorite person, anyway. He's a bit of a DB.
We have a few mutual friends. We pretty much have an understanding that we do not talk about my ex in general. Perhaps 5% of the conversations include the topic of my ex. Usually they see I'm upset and listen while I vent. They don't try to fix it, they just listen and support. If I doubt their intentions of friendship, I drop them as a friend.