Dave, that sounds super hard.
What has she said about why this is happening? Has she shared her feelings at all, pointed to any issues between you?
Yes, it is hard, I feel in such limbo. No feelings other than to previously say I don't listen, I lie, I am living in a fantasy, etc etc.
What precipitated this intense situation was my daughter posting photos on FB after a visiting me for 2 weeks (where she asked that my SO come visit while she was here) in an album tilted "friends and family"; there were photos of my ex and her new man but none of myself and my SO, (incidentally there were also none of my daughters BF)! I explained that my daughter probably had more to post but it seemed to push my SO over the edge and she insisted it was a deliberate slight to show her how she was disrespected and my kids saw her as a slut and I was so wrong for not being able to see how I was being replaced by my ex's new man. I tried to explain, but of course there wasn't much point to that! My daughter even tried to contact my SO to say she was sorry if she had upset her but didn't mean to as she had more photos to post.
As an example of her refusal to see things she insisted that only her arm was in a photo when clearly she (and her face) are the only person in the photo!
Of course she can't see the photo because she has dropped both my daughter and I as FB friends! So she is able to still insist on her view point being correct.
I'm at a loss!