Question: how to respond when someone says they were thinking about you?
Answer: “How do you always seem to know when I need to hear that? ...  “Back at you! ...  “Don't worry about me. ...  “Thank you. ...  “I am so glad I have friends like you.” ...  “I was just thinking of you, too! ...  “That makes two of us.” ...  “I don't know how, but you always know what to say and when to say it.