They call them ex's for a reason hun. I know it sux. I was in love with my ex two years post our relationship, he did leave me for his nasty ex fiancee who had a fat bf and two kids by the fat bf and none from my ex, and I have yet to love anyone else to this day, nor do I see myself loving them as hard as I loved him. The fact remains like I had to move on so do you. It will take time and healing. You must first allow yourself the time to heal and then love again, or at least try to.