Yes, I did see my first T after we formally terminated. The problem was that I quit suddenly, without really settling anything. I saw another T for 2 years, who encouraged me to go back and say "goodbye" to my first T. It worked out well the first time I went back, but 3 or 6 months later (I forgot how long) I went again, and I started obsessing about her all over again. It ended up worse, and I saw a 3rd T to resolve all of my feelings.

Still, I think it was worth it to tie things up with her.

I officially ended with my former T who I've been calling Bt for blunt T, but it was open-ended, so I saw her every few months. That was okay until I realized I wanted a different kind of help, and found my new T, who I've been calling Kt for kind T because she's so kind.

In your case, do you think seeing him could resolve the pain, or would indeed make it worse? What exactly do you want to achieve by seeing him again? If you're like me, what you really want is that "fix" again, and you'll be unsatisfied. But if you think telling him will solve something, or if there is something else left unsaid, that it could be productive. I still think discussing it all with your new T would be more helpful, at least before you try to make an appointment with old T.