Normally most guys show if they do want to be with someone usually what you would look at is the signs such as he initiates communication, he happens to show up were you are, always looking at you, makes reasons to touch you and many more. You can get more information on www.rhomylly.hubpages.com/hub/5_Ways_To_Know_For_Sure_He_Likes_You.
He tends to talk to you about stuff that his best friends don't even know. Tell you jokes or hang out with you more. He may also put his arm around you once or twice. You make think its friendly but he might take it seriously