Would it help to possibly think of it as a test for your T? To see if she's a good one by how she handles it?

I relate to the fear that telling her will end negatively, I really do. However, if you decide never ever to tell her, you won't ever find out about her reaction - you'd only imagine her potential reactions and worry about them.

Could it also be that you need to feel safer with her to be able to tell her? Sometimes, trust is built by taking risks, but sometimes a stronger feeling of safety is needed to take those risks.

How has she been so far with disclosures you've made?