Well, first you have to identify if you actually like this guy. If you're interested, just make conversation. Yes, it sounds hard and terrifying, but stares unfortunately won't make any progress if you are interested. Make the first move! If he's shy, take charge! If he's not interested, then that's okay. Sometimes the people we want to be with only teach us lessons for the person we will love in the future. I could tell you that him moving away means he's really shy and nervous or you, or that he thinks that you do smell. Either way, we aren't him and the best way to find out what he's thinking is to just talk.