I think it was very well written especially that you've realized you are like that with other people, not just with her. I did tell my ex-T. that I was very jealous but I couldn't relate it to anyone else in my life, just her. And, like you, I hated having those feelings. I KNEW all the reasons I shouldn't feel that way but they were there. I used to tell her my mind and heart weren't in sync. I also used to say "I don't know" all the time. However, she didn't email so I would get stuck.
My new T. allows email but I haven't had any issues with her. I think part of the reason is there are large blocks of time between clients so I never see any. In fact, I wondered at first if she really saw many people.
I think it's great that you can talk to her about it and hopefully gain some insight.