Pithy, I’ve read all your posts.
I haven’t read all of everyone else’s and am sure I am repeating things others have said, but in case it helps you to have further reinforcement and back-up:
It is abundantly clear to me that this man is manipulative and in fact emotionally abusive. He is gaslighting you, playing on your insecurities, rewriting history, triangulating, trying to hook you back in with false promises, love bombing. It’s textbook, truly. And has anyone yet mentioned the wonderful Mumsnet term of “cocklodger”?
You have such good insight but because you are in the thick of it, and probably because of vulnerabilities that aren’t your fault in any way but are nonetheless relevant, he has still been getting to you. You should be so proud that despite all that you’ve stayed strong.
This is serious. It meets criteria for domestic abuse. If he continues bombarding you in this way - and he likely will - you can ask him to stop communicating with you as this is harassment. Some people get non-molestation orders for this type of thing and regardless of whether or not you want to (if you do, local or national advice and support would be available) that’s how serious and unacceptable his behaviour is.
You did an incredible and brave thing in asking him to leave. It’s ok that it’s hard to cut ties: he is a headworker, and you are probably in a trauma bond.
I am so sorry your previous experience of therapy was counterproductive, and this isn’t unheard of. Don’t write off other therapy either though, now or down the line; a knowledgeable and better informed practitioner could really get to grips with the situation and with you.
I’m so sorry for what’s been happening, and so proud of you. What a wonderful mother you are, too.
Edit: he thrives on communication from you – any communication. The content of what you say doesn’t matter and you cannot reason with him. He wants the drama. Nothing you say will actually change his perspective. You’ll be in a circular argument from hell. Keep him blocked: cut the oxygen supply to him, and keep your own.