I have to agree strongly with Aphrodites on this. I finally talked with my mom and sis last night about my bpd. I decided to tell them even after the majority of the advice I was given was to not tell them. I should have listened to the majority. It did not go well at all. They completely dismissed my diagnosis. Telling me they don't believe it. It was not at all what I was hoping for. I was hoping for their total support. And now that I did not get it I am completely crushed. She looked in my eyes and said "I don't see it". I was screaming "it's not something you can see". Even my T said don't do it cause more often than not it goes badly. Now it's out there and I can't take it back. Now my fear is they have told the rest of the family and I am already being talked about and judged.
So my advice is be extremely careful who you tell you have bpd. Once it's out there you can't take it back.