this is a reasoned approach to a devil of a problem! Walking away from a T relationship where there was some growth, but serious issues, is really really hard.

I think I felt through my whole therapy that there would be this great shining moment where I said goodbye, cried and told my T that we had done so much great work together and then rode into the sunset, healed with a great new life.

Sometimes it doesn't work that way. Maybe more times than I thought, since I internalized most of the problems and felt very tentative speaking out. You have seen what you need, and I think that's commendable!

His agitation is also what I have questions about. What did he say? How much did he "own" the issues that you brought up?

Because this is someone you respect and admire and benefited from, is there a way to do a salvage? In any case, would another appointment help? I'm hoping I'm not projecting terribly here, but it helped me a LOT to talk through this stuff with my T, and I didn't admire or respect him, not that much ...though we still were able to accomplish some things.
Also, if he was really feeling agitation, he might be even more able to clarfiy things when the heat of the heat of the moment has cleared somewhat for him.

On the other hand, if you're done, you're done. And you'll know, I bet.....