[header] How to not hate your ex [title] Write down your feelings. [step] Take out a piece of paper and spend some time writing down why you have hatred towards your ex. This could be because of the things he or she did to you, or the decisions you made while with your ex. 
Try to be as detailed as possible and do not be afraid to really be honest about your feelings and emotions. [substeps] It may help to do this over a period of time, adding to it every day until you feel you have rid yourself of every instance of anger or pain you associate with your ex.