I have been in that oh-so dysfunctional dance. Nothing works there. I think if you calmly and honestly sit down with yourself and ask yourself the question "why do I want to get in touch with this person?"... .I think you would be hard-pressed to find a healthy answer to that question. I know if I was brutally honest with myself that I could only find a not-so-healthy "urge". Nothing good ever came of me succumbing to that urge.
I've been through this dance, too. Like you said,
Figuring, it usually "goes south" pretty quickly. BPD is very much a persecution-based disorder, so you usually get to a point where the pwBPD starts shifting blame and goes into "victim mode."
I'm so sorry you're dealing with this,
Figuring. I know it hurts. I'm going to echo
Infrared - I think it might be helpful if you ask yourself
why do I want to get in touch with this person?, and be honest with yourself about the answer.
It's important to take care of yourself. You deserve it.