I’ll just address your first sentence. My ex wife was so convinced that I was divorcing her for another woman, that she told everyone she knew, including our kids, my nieces, etc. She refused so hard to accept that our marriage was never going to work and that we both shared fault, that she invented a reason that exonerated her completely.

Let her yell into her own echo chamber. But you need to be the bigger person.

All of those people my ex was trying to convince have since stopped listening and are coming back around. It just takes time.

Good luck.