I think he is using me for sex.

Hi am a gal currently livig in cape town, am 21 years nd i hve been dating ths guy for 5 months nw…hez nt from south africa so during the holidaes he went home. when he came back things we not the same. he started accusing me of cheating nd ths other dae he told me i was boring and our relationship is nt working, well we broke up buh a week after we got back together nd he told me that he has a gal fwnd from home and he doesnt wanna end things with her, he told me he doesnt want our relationship to b all that serious. i dnt knw what to do i wanna let him go buh its so hard coz i always see him on campus….when ever he calls me to go to his room i go nd we will hve sex, i think he kinda using me like he calls me when he wants sex…..plzzz help