i want my ex back

how can I make my ex-boyfriend come back to me? I know I have done wrong to him. but I already apologized to him. but somehow he seemed unwilling to forgive me. I was sad. What else should I do? the world seems dark right now. I loved him very much. I do not want to lose him. he was everything to my life. is there any way that he will forgive me? apparently he hates me. every time we met, he always turned away. I am very frustrated. why is this all could happen to me?!