I agree d@ve.First of all, this is too cute. I'm sorry that it's so frustrating, but it really is cute. Anyway, I agree with what Raz was saying "let's cuddle" LOL! You now have him wondering what is going on. There is no reason to wait a few days or anything like that I don't think, but perhaps the girls on here have a different take on that. I know I personally don't like waiting games.
If he has any guess at the real reason why you wanted to talk he'll remember and remind you (typically).
He is probably thinking there is something extremely bad that you have to tell him or something very good you have to tell him. Especially given that you told him you needed to talk to him in private. DON'T write a note. Why? Because you have already told him that you were going to TALK to him. So you kind of dug your own grave.
I'm GUESSING that he already knows what you have to say. But he won't tell you that because he might be wrong. So it is still up to you to bring it up again as he more than likely will NOT bring it up. We are just as shy as you are dear and you indicated that you would be the one to talk to him about it, not the other way around. Do not worry though, whatever he says, he will still want to be your friend and keep your friendship unscathed. He will not make fun of you, in fact, he will probably really appreciate your efforts to keep things private. Good luck and smile!
He might bring it up. I say about 50% chance. He probably already does have an inclination for your reasons of talking with him. He definitely won't say anything one way or another till you confirm or deny those suspicions.
Also, yes it rather cute. I feel really bad for you (it's still cute though).