I would be absolutely mortified if this happened to me. I believe and trust that what I tell my T is completly confidential - although understand that my T has to have supervision so my stuff may be talked about as a "case" but I would not expect that the supervisor would be able to identify me at all from what my T shares with them.

I guess I accept however that if my T had real concerns about my ability to keep myself safe that they would reserve the right to breach our agreement, but again when possible I would expect my T to tell me this first.

I wonder if your T may have some concerns about your safety? Also I wonder whether you can discuss this with yout T face to face or via letter / e-mail? It may help you understand why your T felt it necessary and may start to bridge that gap in trust.