granite I'm not sure, but I have read that you can recover from bpd. I read that symptoms can lessen over time and even if you were once diagnosed with bpd, you could later not meet the criteria for diagnosis anymore.
I guess if you were once bpd you're more 'suseptible' to suffer from it again, like with depression and eating disorders, when you go through rough patches or stress it could 'come back'. But I don't think that it has to come back. I think people can recover for good.
But it's just an opinion and from what I've read from books. I've not read personal experiences of people recovering but... who knows!

Maybe, you could get re-diagnosed to see if you still meet the criteria? Would it help you to be 'officially' non-bpd in your records or whatever? I know with my anorexia I would be upset if I was still 'classified' anorexic once I no longer was! (like now, I like to say I am a "recovering anorexic" but eventually I will just be... not anorexic).