Probl�me de gar�on...(Please help!)?

Well, just act normal. If you worry about it too much, he's going to think that it's true. Act natural, calm, and it'll go away in a jiffy. Sure, boys will get a slight shock from finding out someone likes them, but sooner or later that information's going to slip to the back of their mind, and act as if nothing happened. Also, you might want to talk to your friend to keep these supposed-to-be-confidential-things hush hush.