When you find yourself romanticizing your ex and thinking about how great he or she is, remind yourself of all the reasons you broke up.  Whether the two of you just weren’t right for each other, or you had completely different values and beliefs, there is an explanation for why you broke up. Try making a list of all the reasons why you just don’t work together. It will help you to stop fantasizing about the past and you can pull that list out when you need to remind yourself why you’re better off alone!