I'm kinda where you are at, stars. I feel a certain fondness for the times I had with my HPD friend, and I also feel some sympathy for her because her life is such a wreck right now. I can't say I've ever considered contacting her again, though, just because I know what will eventually happen - she'll 'play nice' for awhile, perhaps we'd even have a few more good times, she'd offer up half-hearted 'apologies' such as "I'm sorry you were so offended by my behavior." (which is really just spin, she's basically blaming you for getting angry over something you had every right to be angry about.)
after the 'playing nice', though, then the subtle manipulations would start up again, and gradually build until an atrocious falling out occurs again. I've decided that for me, I personally don't have the emotional energy to deal with all of that right now. no one should have to deal with it, regardless of whether they have the energy or not. the thing is, she probably hasn't changed.
I guess I believe that possibly my HPD friend 'might' change, if she's forced to see that her behavior has cost her all of her friends and her lovers. If people keep going back to her, they're just feeding into the sickness. while people might have noble intentions to help her and heal her, that is just not going to work unless she sees how destructive her behavior is on her own, and takes her own steps to heal.