hmm... try dropping some very subtle hints. dont go too far out though or else it may backfire. like a slight touch on his shoulder or torso or something typical like that. of course dont just do it at random. you gotta time it like after he says a funny joke or something or when you two might be clowning around. then just gauge his reaction.
try changing something, very subtle. your hair style, a new shirt, new makeup or whatever, i dont know lol. just to see if he notices it.
thats all i can think of, im not that great at this stuff either lol.