Reading that, almost wonder if I didn't have two run in's with BPD's.
Think I am magnetized for attracting PD's.
Now I know a bit about BPDs, I can look back and see two different friendships over the years, with women my age who behaved in confusing, hurtful ways until eventually, in each case, I just stopped replying to anything, stopped seeing them. I now think they were PBD as well.
When it's a social friend, it's a lot easier to break it off and escape. But it followed that same pattern, getting on incredibly well as soon as we met, thinking I'd never had such a great friend... .until they started demanding more and more and more of my time and attention, being hurtful and cold and distant, then coming back and being so nice to me once more... .
I think I am "magnetized for attracting PD's." - but not for much longer, with the therapy I'm doing

I think BPDs are so desperate for approval and love that they fling it out all round them all the time.
Most people will quite like them but at a level of "oh yeah, Jane's a great laugh, but you can't take her seriously haha" and that's as close as they bother getting.
A few people get closer, get drawn in initially, but the very first displays of bad behaviour, and they walk, whether as friend or lover - because they know that friends and lovers have no right to treat anyone this way.
Then there are those of us who stay. Because we believe what we're told, that this is 'meant' to be, that we've met our soulmate/ bestest-friend-ever, because we justify and make allowances for the BPD's bad treatment of us. And we get mangled.
And I think what I want to gain from therapy is the ability to value myself highly enough that if anyone ever starts treating me badly in the future, as friend or lover, I have the self-esteem, self-awareness and self-protection to just walk, at that early stage.
Because this is not my *fault* - but I do see that I went along with it all, I allowed him to treat me that badly, and I kept on allowing it. My craving for approval and love was pathological, just as his is. And his craving damaged me, but my own craving allowed him to damage me.
So yeah, I think a person who is what my therapist calls "chronically under-loved" can keep on finding themselves in these destructive damaging relationships... .where a more healthy-minded person would walk away far earlier without hurt.