I'd imagine its a lot down to the people involved, if dispite bpd they are loving, sensible and honest people, the bpd will just be like any other issue a couple has to deal with, so I wouldn't automatically assume it wouldnt work. As for the main point of your question, I'm guessing you mean is it something people find occurs without planning, that a bpd would be drawn to a bpd - or if they are, is it just coincidence?... Hopefully the peeps on here that live with being bpd can maybe shed some light on if that kind of pairing seems to be common or not.