What can I do because I love him? PLEASE HELP?

If you're comfortable talking with him, you should tell him straight up. Tell him the one you like his HIM and not whoever else he things you like. Tell him the guy that wrote on your facebook wall is NOT the guy you like. But if you're not comfortable talking to him you could get your cousin to help you, I don't see anything wrong with that. But I think telling him yourself would be better. :)