Y did he brake up with me without an explanation??

ok well i wuz going out with this one guy 4 5 months and i thought everything wuz going good and everything..and i really loved him and supposly he would always tell me dat he loved me to..their wuz only one thing wrong(we went to diff skools and we barely saw each other)also he would talk bout alot but im still a virgen so nothing happen you know!!!but anyways we would talk bout everything and he would always make my day but one day on the phone we started arguing and usualy we would make up but not this time we really went at it for like 30 min and then he just said it was over like nothing..and i called him bac and asked him y and he wouldnt tell me..he would just say dont worry bout it and its been 1 week since we broke up and i still dont know y..but the thing is we havnt talked and i really miss him and ive been cryin myself to sleep all these night..so y did he brake up with me..plz help y do ya'll think??