Well, I've been friends with her ~17 years. I didn't know in high school that her "fussiness" was BPD but now looking back all the warning signs were there. She got diagnosed in college (10-12 years ago) or shortly thereafter when she attempted suicide a few times. We had drifted apart during this time and as I understand it, she had gotten more than one diagnosis but was burying her head in the sand about it. 

She started regularly going to therapy about 2-3 years ago. She's made a lot of progress but some days are better than others, obviously.