I would probably never utter such a thing to a tbut if I did, "I know" would strike me as patronizing and distancing. There's gotta be a way for a to respond to "I love you" that is genuine and feels good to both t and client... maybe if the t couldn't bring herself to say, "I love you too," she could say something like "I'm touched to hear you say that. I care a great deal about you too?" That would feel far less s#!tty to me.