I agree about exploring the anger and disappointment that you have with your own therapist, if you don't already have one. The resentment is understandable. Whilst in the throws of your own anguish, if any suggestion I have is that he's probably not going to be receptive or may internalize unproductively until he's already worked through these behaviors in individual therapy.

As much of a cliche it is, time does mend all wounds. It's a tough position to be in moreso because of kids. I don't have advice about staying or leaving. Keep working on yourself and finding your own inner peace is my advice, you need that no matter what you decide.