I like this boy and ive liked for a few months and i dont think he likes me. how do i get him to like me?

im 12 and he is too, we have like 5 out of 7 cles together so i c him all the time. we dont talk all that much. hes cute,popular and we have most of the same frends. we used to talk mor in like september and october. i invited him to my bday party on friday and hes ing! im glad but nervis. i like him so much and think about him all the time. wat shood i do?