Definitely has a crush on you, trust me girls did this to me all the time during secondary school... They're just nervous/shy. My advice is to not throw him into an encounter (i.e. party) but rather speak to him alone, not too directly like 'hey, do you have something you want to tell me?' - maybe ask him out somewhere nice and comforting? For example, 'hey, do you like action films?' - 'Great, wanna goto the cinema with me on xx/xx/xxxx?' should work (if you want to pursue)