what do I do when a guy won't admit how he feels about me?
NO NO darling. Dont tell him how you feel. Bad advice above. Ok so you should definately have given better information about your relationship/friendship with this guy. But from what I've read I can tell you that a guy who is really really into you. Will make sure he gets his point across. When a guy makes the decision that its you he wants, he'll do anything in his power to make sure noone else takes you. If you want a real indepth opinion/outlook read "He's Just Not That Into You: The No-Excuses Truth to Understanding Guys".. surely you'll get a clear understanding of what I'm saying here.
tell him how you feel about him back .. if you dont feel the same as he does just tell him. he should understand if hes a goood friend :]
well he either doesn't like you in that way... or is shy