he likes you but he's got confidence issues. torpe, in one word.
your problem is not how to make him like you. that's accomplished. your problem is how to help him relax around you. i'm afraid you're going to have to approach this guy if you want something to happen. befriend him or talk to him when you meet at the hallways.
if you girls get frustrated that the guys you like are too slow, please realize that it takes a ton of courage for some guys to make a move. this is doubly true for the inexperience. of course, if you help them along, the rewards are doubly awesome.
relationship-noob guys are the most likely to be serious (to the point of insanity, sorry to say). like manny pacquiao's first professional fight, they will be giving the relationship their all because they are that hungry for it.