Do you have any resources or tags that deal with having personality disorder and being in a poly relationship?
Here is my resource page on mental health and polyamory! As far as I can recall, the only personality disorder I have fielded questions on is borderline personality disorder, and you can check my “bpd” tag if that is relevant for you.
Most of the resources I found also focused on BPD, though I know that is not the only personality disorder. I cannot vouch for the accuracy of these, since I don’t have a personality disorder, but this is what I’ve found:
Polyamory and Borderline Personality Disorder