How do you forgot your first love?

Losing a lover is a little like having a close friend die. You need to go through a version of the mourning process: Denial, Anger, Bargaining and -- eventually -- Acceptance. It may take some time. While it's happening, keep your friends close. Don't isolate yourself. You may need to force yourself to remember all the bad things about your ex. It may also help to ask yourself what you've learned that will make your next relationship stronger.