Well I tried to discuss some of the ideas and she blew up, insisting that she is working on her stuff and will not read or discuss anything related to her behavior. So that failed. I haven't tried it enough yet to know if a one sided approach will work.
Yes, I know how you feel. It's demoralizing. Sorry to hear that.
Unfortunately, it takes only one person to change a relationship, but requires two to make a commitment to saving it.
I tried some of the suggestions, such as boundary setting. I found it made it worse:
A) Leave the room, try to establish boundaries - you are abandoning
B) Stay and argue, try to establish boundaries - you're bullying and controlling
C) Stay and ignore, try to establish boundaries - they will escalate until they achieve A or B, nothing infuriates a pwBPD (ime) quite as much as being ignored
I never found any solution. I came to the conclusion that if there was a solution besides DBT, people would have discovered it long before I was born.
I wish you the best of luck anyway canttakemuchmore!