Clearmind, I was just going to add that. After I posted my reply I remembered that when a significant other demonstrates commitment to a pwBPD -- the opposite of abandonment -- the pwBPD can't handle that either.
That's when my ex-BPDbf started pushing me away, when I was getting down to put up-or-shut up time and how serious I was about making our r/s work.
This one fits my past well... . trouble started 2 weeks after we moved in together. Way too "close" and more than she could handle.