Question: how to respond when someone says they've been thinking about you?
Answer: “How do you always seem to know when I need to hear that? You're the best.” “Back at you! Hope all is well.” “Don't worry about me. ...  “Thank you. ...  “Thank you for thinking of me!” “I am so glad I have friends like you.” “I was just thinking of you, too! ...  “That makes two of us.”