According to my experience my T is trustworthy and I am confident that nothing leaks out from him. If I wouldn't have that confidence in him, I wouldn't see him.

I'm not in US and in my country, there are no cases when he would be legally mandated to reveal anything to anyone (not that I would have done anything like this anyway). Also, no insurance involved, so no one can request any information from that side either. It's just him and me and whether I personally consider him trustworthy or not.