This guy you met on a chat room keeps telling you that he loves you because you get along and you dont feel the same way but you dont want to hurt him what do you do?

How about this?

"Ooh--that's sweet of you to say! But of course we don't really know each other at all. I could be a 70-year-old man for all you really know. So let's just keep it friendly but not get more personal than that. Ok? Otherwise I won't really want to chat with you any more."