

Hmmm I think I will go with “fandom”, or being a fan of something. Like, I enjoy concepts. But there’s no universe or product or franchise or sports team or whatever in particular I would consider myself a fan of.
edit hope this counts as behavior lol
I’m diagnosed with BPD and met (quite some) other people who were diagnosed over the years. I think your theory is bullshit – but not in a rude way, it just doesn’t fit what I know about BPD and the women diagnosed with BPD I got to know.
Modern treatment methods often follow a bio-psychological or bio-psycho-social model. This is a oversimplification, but BPD is usually a biological/genetic predisposition to be more emotional + bad experiences in your childhood, leading to strong negative emotions and the lack of mechanisms to regulate those emotions, which cumulates in impulsivity, unhealthy coping mechanisms etc later on.
There’s overlap with the vague concept of hypersensitivity and ADHD; there’s differential diagnosis too, which is “hey, this can be similar to that, let’s diagnose properly before we do anything”; and there’s comorbidity.
I agree that trauma plays a big role, and I would go so far as to claim every BPD person is traumatized in a way that justifies therapy, but PTSD is a specific diagnosis, just like autism is.