My T has told me that she has missed me and will also tell me that "it is really good to see you". I know she means it because she wouldn't say it if it wasn't true. I guess I liken it to missing my students when I don't see them for a while or there is a break from school. I care about them and I know my T cares about me. I think it was wonderful that your T was open and vulnerable and shared those feelings with you.