I found out when I found this forum actually.

I always knew something was off, but being dxd with bipolar disorder filled in those blanks for me.

I was having relationship difficulties with my bf and realized the people on this board were the only ones who understood...

Incidently my pdoc agreed with me that I had strong BPD traits after I brought it up and we had discussed it. But after a while it became an official dx along with my bipolar and OCD.