just jealous?

so ive really been into this guy for several months now. once school got over i was worried that we wouldnt be able to see eachother as much.well i was right. its about half way through the summer and ive only seen him twice. the first night of summer and again about 4 or 5 days after, we went to the movies. when i left for vacation the following day i found out that he liked me, and i haven't talked to him since the movies. ever sincee i came back from my vacation ive tried to hang out with him but it never seems to work. im always the one makin the effort and makin the first attempt to talk. hes an extremelyyy shy kid so it didnt bother me as much at first. but im not exactly the most outgoing person either. anyways, when i look at his facebook on occasion this petite, gorgeous, popular girl writes on his wall obviously flirting. and he flirts back commenting on her pictures "your hott" and "wow". but hes never once done this to me, however not even a month ago all his friends could tell for a fact that he liked me, and then he admitted it. i cant tell if hes moved on from me, or if hes embarrassed by me, or if im just really over thinking it and being that jealous girl.HELP!