hi fptoabf, and

i think a good place to start is from a point of acceptance that a diagnosis of BPD is earth shattering, and this is going to involve some rocky roads. it can be a serious lifeline, but things can also get worse before they get better. realistic expectations are critical. the role you play/can play, is critical.
some questions that will help:
forgive me, but what does FP stand for?
what are you looking to set boundaries around?