This is a good question and one that I've been thinking about myself...

I know my T cares about me in session because she listens very carefully, encourages me, provides support, and wants to see me grow. I would like to think that she cares about me as a person outside of our 1 hour sessions but I honestly don't know because she is not one to explicitly say it. She sets good boundaries but it would be nice to hear from her that she cares and maybe thinks about me sometimes.