The sure test for bona fide BPD is when she rages. If you see her literally morph into a seething 13 year old, like her whole demeanor changes into that, you've got BPD on your hands.
I think that BPD is a spectrum anyway. There is a line that they cross for diagnosis, but as
@spikeanut says, an official diagnosis is worthless. They're all somewhere on the spectrum.
The fact is that all women gravitate toward chaos. Chaos and confusion is their natural state and they are all in desperate need of male guidance, authority, and stability. My fiancé is by far the most stable woman I've ever met in my life, and she needs very little management from me. Just a little here and there. She is perfectly submissive and incredibly stable, but she's still a woman, still needs a rare correction. The fact that correction is rare is the reason she's such a keeper.
Just letting you guys know because your workload and emotional upheaval is very minimal with the right girl, and they are indeed out there. They are very rare, and they tend to marry off early, but they are out there. To attract one, you need to be superior and you need to have standards and a well developed moral character. Yes, I said the M word.
I always try to drum into you guys that you must be superior to women in order to attract them, but it's seemingly impossible for the majority of men to accept this. That's nothing more than residue from their feminized education and upbringing. Women crave correction and authority from a man whom they consider superior to them, but most of you will reject that idea.
You must internalize that YOU are the authority, that YOU are the disciplinarian, and leader. But a leader also serves whom he is leading and sacrifices for whom he is leading. The rewards are great for the man who learns this. Woman go crazy over such a man.
I used to be an invisible nothing to most women. Now I know what it's like for women to be pestered by admirers all day because I go through the same thing. I go out and I just don't want to engage. Why do I have this "problem"? Because I radiate kingship and authority. Why do I radiate this, when I used to be a nothing, a zero? Because I have embraced my authority and superiority.
Women are the embodiment of chaos. You can have the keys to the kingdom when you recognize this and contrast that nature against your own God-given expectation of authority. The way to start is to stop being afraid to offend women. Once you lose that fear, you start to calibrate and you start to learn how to become a King whom women flock to, because of their own need for guidance and authority.
The paradox is that as an authoritative leader, you also become a servant and protector, and you recognize that sacrifice is part of being an actualized man. You find yourself becoming friendly and well-liked, but also slightly feared and definitely respected.
All of life is paradox.
How does a zero become someone who is bothered by women vying for his attention when he just goes to the grocery store? He accepts his God-given mission of being an authority and leader to women, and he loses all fear of offending them.
In the end, it's what you PROJECT that is what makes women FEEL. Women's feminist tendencies melt away in the presence of such a man. They adopt a pseudo-feminism in life because they are trapped in a complex social web and they must survive there. A man who is outside the confining, suffocating web is her ticket to freedom.
I sure know how to go off on tangents, don't I? But perhaps there's a nugget of truth here.