Yes, I told my current T "I love you" several times (and I also have written this in emails). Her response the first time was "You do know that I love you." She said that for her saying "I love you" in response to someone saying to her she reserves for her husband and her mom (no kids). One time she said "I know you do," which didn't feel so great at the time even though I know that she loves me. Another time I said "we love you" (meaning all parts of me) and she responded "We love you, too." A few of other times when I've been in a rough place she's said "I love you" or "You know that I love you" when giving a 'pep talk.' We've also talked about how, on a personal level, she doesn't feel that it's necessary to say "I love you" often to people in general because it's just there and it's like stating the obvious. Like Chopin said, her actions and the way she looks at me with so much caring and love in her eyes scream out "I love you."