Is this why some of them breakup and disappear? Their thinking is that they are attempting to protect the non from their 'crazinness'?
Haha! Well, not I'm experience. They don't think they are a toxic mess and should go clean up. They just continue rolling down the hill picking up trash and running into people's lives without a thought for them or the destruction they cause. If they 'disappear' it's because they have some kind of new supply, online, flirting, offline, dating, whatever, they are in CONsTaNT need!
I suppose if a BPD wants to recover or is in recovery it could be the case but without that insight I'd have to say NO