I think once you reach a point where you are uncomfortable with your T, you definitely have an issue on your hands. I believe you should discuss this with your T, or if you are beyond that point, find another one.

I can understand why you would be uncomfortable. I would not be comfortable sharing T's with my ex.

Keep us posted on what you decide, and how you handle it.

It's such a shame, because it sounds like you have an excellent patient/therapist relationship prior to this. That is difficult to find. I'm sorry you are faced with this.