I was in a romantic relationship with another borderline for 3-4yrs. Worst relationship I've ever been in - we fed off each other, triggered each other, etc. It was horrible. Would not recommend unless both parties are well into recovery.

I have a few friends who are borderline as well - we are all in different stages of our disorder. I distance myself sometimes when I don't want to ride along with their turbulence, if that makes sense. Boundaries are very important.