I have looked at myself and identified it.

I'm not BPD, but I have (had) some traits that I mostly aged out of by the time I was 30 and had lived and thought. They were not really hard coded.

I have traits that draw these women to me (above average but not super hot, quiet, seems understanding and kind) like they sense my susceptibility. Also, I've never had an easy time approaching women or with rejection. So, when these low-hanging-fruit type women approached me and offered female affection and sex, I was easy prey. Simple lack of confidence and abundance.

Life and achievements have left me much more confident, lifting and gaining weight has added a point or 2 to my looks, and not giving a fuck and going monk mode for a while and reading TRP got rid of my thirst. This was all multiplied by reflecting on my experiences.

I did not date the second BPD for very long before I was on to her shit, calling it out, and then walking....I did come back for seconds for a short time, unfortunately.