Turning the focus onto ourselves, even if its to admit mistakes, is often far more productive than analysing our ex behaviours. I've learnt the following things I did in this relationship and will make every effort not to repeat my mistakes with my next girlfriend (who also wont have BPD!

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#1 - Giving up things I enjoyed to please my partner, changing opinion to suit hers, losing friends she didn't like, rarely seeing my family and spending all holidays with her family, giving up meat for her, stopped writing my blog as she was against it -
Approval Seeking Behaviour#2 - Ignoring warning flags and taking hits on my principals in order to be with her - Inauthentic/Principal Breaking Behaviour driven from fear/lack
#3 - Became resentful (because of #1 & #2) and then became disinterested, after the first few months I stopped asking her how she was, stopped taking her out on dates, she would get dressed up in sexy night attire and I'd just ignore her.
#4 - Denying reality in order not to face the eventual pain of a break up! Heck I got married to avoid the pain I am going through now. Ironic.
#5 - Problem Solving instead of listening - More fights were caused by my volunteering solutions to her many outlandish and numerous problems with family and co-workers whereas actually all she wanted to do was blow steam. I would then cop the cold shoulder or silent treatment that she actually wanted to give them as her anger could be transferred to me.
The biggest mistake of all, and one I'm still guilty of, is not valuing myself. Why do we want to be with these abusive people who clearly do not value us. I don't know about you guys, but I have a good soul, I'm kind and am fun to go out with, I am a catch and yet from this relationship have come to view myself as unworthy of love and the healing is a bumpy road, some weeks I am perfectly fine, others, I feel very bleak.
What mistakes did you make?