What should i do my ex is driving me crazy?

oka we broke up because of compecated dision i made and he was like if u really loved me u wouldnt of put a knife threw my heart and i dont have time for an relation ship ive been in so much pain these frew months with death and family probs and hes like ill make it better if u go out wit me im like that will only give me more stress hes not listning what should i do because he wont stop bugging me hes like a fly all ways like your mom was so wrong dont listn to her come back out wit me and he wont leave me alone what should i do