Most Helpful Guy
Read the signs, girl, the callings, the obvious. He's shy of course and might use that friend to get inside knowledgw on you. Make her a double agent and tell her to tell him you like him. Make sure she says she is telling him secretly. Also make her tell you what he says to her.
Most Helpful Girl
Don't stress, become friends and approach him. I wouldn't automatically assume he has a crush on you, make sure you know him well before you make any assumptions. If he glances at you simply smile back or wave. ~hope this helps