Hey Mr. Irrelevant, nice to meet you
While I'm not sure if "high-conflict person" is an official or diagnostic description; it's a descriptor that I believe author/lawyer/therapist William Eddy coined, and it's pretty apt.
You can find his definition of a high-conflict person here:
https://www.highconflictinstitute.com/hci-articles/who-are-high-conflict-peopleBriefly, "HCP's":
-blame others;
-have "all or nothing" thinking patterns;
-have unmanaged emotions; and
-have extreme behaviors.
There isn't necessarily, according to Eddy, a 1-to-1 relationship between HCP's and pwPD's (people with personality disorders), though there can definitely be crossover.
Check out the link to see fuller descriptions of those traits, and let us know if you think it tracks with your pwBPD.
Hope that helps;
kells76