I mean no offense to anyone with bpd. But in my own unique case, the easiest (and shortest) relationship for me to ever leave was the one with my emotionally abusive borderline. I have read extensively on that disorder because I somehow missed it in college psychology, and boy, when you are in a relationship with one, it creeps up on you and mutates into something sinister.
Personally, life only got better and better each day that the relationship was over, and I still feel like I dodged a bullet. Even if I did know anyone she knows (I don't), I realized I just needed to count my lucky stars that I dodged that bullet. So I guess it's like my friends all said when I ended it - I pity the next guy she's with, but I had too much taking care of myself to do to go warning anyone.