I'll agree, with the caveat that perhaps if the BPD person admits they have BPD, is in therapy, and is trying to get better... sticking around may be OK.
But it's no different than when someone has alcoholism or a drug habit. If they don't want to get better, get out.
But it's no different than when someone has alcoholism or a drug habit. If they don't want to get better, get out.