How do i stop obsessing about my ex?

Time faith: It will take a long time. Need to talk to a therapist (psychologist), it may take a several tries until you find one of your liking. Self medication, exercise, counseling, obtaining support from those around you, including friends and family. You won't forget your ex, but you will learn to put her aside. Set new goals, projects for you, now that you are by yourself. . Good luck.