I have shared S thoughts with my T aswell! It felt good in a sense to actually be able to talk about what I was feeling, I wouldn't have told anyone else of those thoughts, and she was very good a calm which is what I needed.
However, on the times I have mentioned it and discussed it. I have left the sessions feeling very vulnerable and very needy. Which is something I really don't like feeling. It's hard to have that discussion then sit on it until next time. I also felt guilty for saying this, like I was putting too much onto her shoulders. She has said that is not the case, but still i can't help feeling maybe I shouldn't mention it so much, this tends to result in the following sessions of me trying to shut down and maybe push her away.
I'm not really sure I have any advice, but I suppose just keep being honest with your thoughts and feelings, keep exploring them, and try not to push away.