OMG SOMEONE HELP ME?? HES TREATING ME LIKE THIS?

this guy has bad temper but he keeps gettin mad at me and frustrated when i ask him if hes cheatin on me or not. he had an away msg on aim and i read it and he was talkin about some female and i dont know but he just seemed like he is talkin to some other girl. he said "if u keep askin me that again im gonna delete ur num and block u on aim" etc. "dont keep readin my **** i dont care wut u think" what should i do?? i just cant forget about his *** because he hits me up sometimes sayin whats up, wut u doing, etc. what should i do??