He may think things are awkward between you two. Since I'm not sure what kind of communication you had with him...whether that be over the phone, over via text, in person, etc. I've noticed that things tend to get awkward when you talk a lot over text...and then in person it's like...woah, who are you?! He may just be shy too, like everyone said. Usually the outgoing ones don't make things awkward but since they are he's most likely shy. Either that or he knows you like him and may just be a little...freaked. Just give him his space, a guy will be a guy. Hope everything goes well! Feel free to ask me for anything else!