This is one of the major problems in platonic friendships - one side, and it is usually the guy, wants to move it on a stage, and the other half of the relationship is comfortable they way things are.
I would agree - don;t bring it up, but be prepared if he looks like making a move.
It can be difficult to salvage the situation, and the friendship, but it can be done. If he makes his feelins known, tell him how flattered you are, but don;t lay it on too heavy about not feeling the same way - he will get the message from your body language and lack of response.
Although - as advised, someone may be misreading the signals, or the conversation. I have had a lot of seriously close platonic girlfriends, and seriously fancied all of them, and even been in love with some, but never made any move because my philosophy is, if a woman wants to move things on, she will let you know. If she doesn;t let you know, save your friendship from damage, don;t go there.
Maybe somone could point that out to your friend, and save trouble later on.
Good luck.