I am dreaming of my ex everyday, though i hate him.. why this is happening to me?

i had a break up abt 2years back. i tried 2 forget dat guy. now i m very happy but i still hav dat heartache 4 him. but i hate him 4 wat he did 2 me. recently, i m dreaming a lot abt him. nearly every alternate days!! what do i do.. i cant get it?? is sumthng abt 2 happn.. r these dreams some kind of indications..