Why and why? :(

dear god,why i'm still missing him even he no longer be my bf..and now someone like me but i dont like him..everyday i'm thinking about it..why i can't accept him..and i dunno what to do..i already told him just forget about to couple with me cuz i can't love him back..i'm really sorry you and now i don't want to hurt you again.. :/ please understand me! i'm just don't want to think about couple or what..