In my case since my ex wbpd monkey branch back to her ex.
She has charm me twice now the first one was that she love me so much and the 2nd one she was trying to either get sympathy and further attack me but from what I have read when they get a replacement your non existing to them or is this just testing the waters, what drive them to do this and why continue the devaluing stage if they have already move on
BPD fear abandonment, so she might consider you a safe fallback position in the event her needs cannot be met elsewhere.
You cannot place any emphasis on what they say; you can only assesses their behaviour.
If the behaviour is odd/inconsistent, don’t bother putting yourself through more turmoil, and it sounds as if she’s run you through the wringer a time or two already.