hey blackbirdsong
i feel ya on this one, and it is really tough on a person; it does make you feel used. i think its a bit more complex than that, and your post points to (and accepts) some of those complexities, though im sure it still stings.
as you said yourself, you believe she meant the things that she said at the time, and im confident that that is the case.
the inability to/difficulty with being alone is her limitation, not yours. it does not make you less than. it also does not preclude meaning what she said at the time she said it.
i dont mean to over generalize, but arent all relationships really to serve a purpose? ideally, that purpose is not to soothe us emotionally, or to find ourselves in someone else, but then who hasnt done that? past relationships are there to teach us, to impress something upon us, to grow as a result. partly, to prepare us for future relationships. one could be kind of nihilistic and suggest in that case we are all just using each other, but i dont see it that way. we all meant what we said at the time.
i think this is good, productive processing. youre looking at a hard truth, and exploring how it makes you feel. the ol' post mortem, of which you have probably done many, and will do many more, until you reach the point of acceptance of what it all means to you. just dont lose sight of the complexity of it all.
I really felt something for her. Still do.
this is your truth. hang onto it

A BPD is like a vampire she has constantly to feed on new blood. Just try to understand the nature of the beast it will help you to become stronger with your healing process.
putting people into the category of "vampire" does not lead to greater understanding or strength.