Trust is not an all-or-nothing thing, like opening a clam It has an ebb and flo like other feelings, is much more complicated than just trusting or not trusting; depends on the person, your past history, your past history with that person, that person's past history (their response is based on their info, not necessarily anything you say or do), etc.

I think you did well in the moment, feeling good about your T, responding "in kind". I think your angst now is more about it having been an e-mail so you can't see or be sure of the feelings, they're only words on a screen and your own heart and head are getting in there and going overtime and you can't check to see if you read your T "right", if she was just being "friendly" or gauge her commitment at the moment so you could better see how you might want to respond. In other words, you are lacking some information because of the media AND you are alone so able to throw in a lot more of your own head stuff, wholly made up because you can't affirm/deny it with her (so you start making assumptions about how she thinks/feels and she is not there to "check" you).

Relationships/trust takes two people working together, in person. If you are afraid of heights, that you trust a person "with your life" does not mean you are going to go skydiving with impunity, does it