Antlers: You keep justifying bad behaviour. Your own behaviour towards ex MIL. Not OK>
What your ex did is one thing but how you handle yourself NOW is different. And that is what Gineen and I are saying to you.
YOU might feel better if you tell your ex inlaws "the truth". But what purpose can it possibly serve except to further distance you from it all.
Do you really think you are the only one here who had a horrible divorce? Obviously you don't know much about mine although I have tried to tell you. And FLTC. And many many of the others here.
We're trying to help you. So try listening and stop "explaining" it to us. We know. And trust us - we're advising you correctly.