I don't think one termination session would do much to minimize the pain. At this point I think it would probably hurt MORE, not less.

I'm in a similar situation, although there was no "rupture" exactly and I was the one who left in the end. I also wrote an email basically ending and pouring out my heart and received a response of about 4 lines, 7 weeks later. It hurt really badly but in a way it helped me to realize I was mourning a relationship that no longer exists... I think in a way that helps.

I feel your pain because I feel similar in a lot of ways. I hope you get some kind of resolution from your email, whatever form that takes.