He mi8 be liking you bt not loving you...or he doesn't know he love you...sometimes you have to make them feel that they have started loving some one..well you can try making him more jealous...and see where it goes....and u should why he is jealous..
He has feeling for you probably not sure as if now or may too scared to ask you. But emotions cant be controlled so they roll out in the form of jealousy.. so if you like him tell him if not sure give some time but make sure once you reach at point do tell him
Well that means he likes you of course but umm if you dont like him and you want him to stop then you talk to him and tell him to mind his own bussiness but if you like him then just date him
Be flattered I guess, but ask what the problem is. If he is jealous, give them a reason to be. Not flaunt, but maybe talk and ask why, and figure it out for the both of you. Sorry if no good, not good with this sometimes.