I agree with the "past reactions" idea.

My T never loses eye contact with me when I'm telling her something, no matter what it is, so I don't feel as if what I'm saying is boring or interesting...it is what it is, in the moment.
She's really intense with mirroring and I'm pretty expressive when I speak so sometimes it's silly watching some of my expressions being mirrored. It is comforting though because it seems she is really feeling what I'm saying.

Does your T react differently to different things you talk about, usually?