Perhaps you could leave open the possibility to meet for a session in several months, once you've processed what happened w/ new T? This is what I ended up doing (it was about 9 months after ending) and it was really, really helpful for me. I was able to (calmly) verbalize my feelings and I was in a place whereby I didn't need her to agree with my point of view. It simply was empowering to confront her in an "adult" manner. It was hard and I was anxious going in, but I left feeling very good about myself.

Good luck w/ whatever you choose to do - there is no "right" answer, but I do think that some sort of closure would be good, even if it's not immediately, maybe even a letter?