I've learned that I still have issues that results in my being attracted to women with cluster B issues; and worse, the types who are unaware they have issues.
I've learned things about HPD I never knew before.
I've re-learned what I knew but blocked out, that who people really are inside and who they appear to be when you first meet them are often radically different.
I've learned that I was right all along in being not attracted to women who exhibit HPD behaviors, and that if one is going to have an intimate relationship with someone who strongly exhibits those behaviors, that it's to be expected that those behaviors (while not necessarily a bad thing when one is single) probably won't stop even after they are in a committed relationship.
I've learned that it's okay to be assertive (even if necessary, confrontational) when hurt. It really won't drive the other person away, and if it does, that's probably just as well.
There have been some positives too, as well as many ego strokes along the way (her and her friends were certainly very complimentary always). In many ways I feel like I'm more valuable than I ever have in the past, and I've let out sides of my personality I had previously suppressed for reasons I don't even quite understand about myself. I certainly can't say it was all bad. We had some amazingly good times including she was someone capable of being as passionate in bed as I'm capable of. I've learned it does feel amazing to feel alive.