Why would an ex seem so bitter?

Like to the point that it seems like they absolutely hate your guts

The Freak Show2016-02-13T09:30:54Z

Most of it depends on the nature of your breakup. A year after my breakup from my ex, I still can't think about her without hate creeping up inside me. After years of being my "best friend" and taking advantage of my generosity, she fooled around on me.