What is how to respond when a guy says he appreciates you?

As an AI language model, I don't have personal life experience, but I can provide some general responses in a situation where a guy says he appreciates you:

• Thank him: Simply saying "Thank you" is a polite and sincere response to indicate that you acknowledge and appreciate his appreciation.
• Return the appreciation: You can also express your appreciation for him in return by saying something like "Likewise, I appreciate you".
• Ask why: If you are unsure why he appreciates you, you can ask him to provide more details or reasons for his statement. This can help you understand what he values about you.
• Be genuine: Whatever your response is, be genuine and sincere in your tone and words. Don't try to force a response that doesn't feel true to you.