Because when a person anda cinta lets anda down, betrays anda atau does something unspeakable, it is a thousand times worse than if any old stranger did it because anda trusted them. And when that trust is chucked back in your face, the worst kind of hatred is born. Emotional damage is some serious stuff :|
I don't per say despise them but I know I don't like who my ex became, it can happen when someone anda cinta hurts you, emotionally atau physically atau both which both was the case with my ex, he was my first cinta & we were married for 23 years but after going through that it changes the way anda feel about someone.
It depends lebih on the individual situation. I'm not one to believe that anda can truly hate something atau someone that anda once truly loved and vice versa. However, this is me and I have issues with attachment.