What to do now when my boyfriend stops calling me?

me and my boyfriend have been together for a few months now. we have broken up once but are back together now. i was wif him one night, we only juz kissed and touched each other..no !!but after that he stop calling me . no msg nothing. when i called him he said he was busy.i mean how long will you be busy since we are both studyin..its e hoildays now..he is working at a pub only at certain nights.e sad thing is that he told me he saw ma msg but didn reply,,, how long will it take 2 type a few words..i m so sad depressed,,,my friends say i m love sick..i dunno i wan 2 tok 2 him ask him y is it like this but i don know how 2 tell him..i know most probably we would fight