[AnKleBiTer]

It takes time. Grief over loss directly correlates to how important the loss is to your life. Each person is unique and individual. There's no time frame to getting over someone, it takes as long as it takes.
I don't mean to sound clinical but it really is true. Elizabeth Kubler Ross has done some excellent writing on the stages of grief and loss as it relates to anything you lose in life. I know for a fact that there are some excellent reading material on the subject. I not only did a speech for my forensics class on grief but I've suffered from a few losses of relationships due to breakup and/or death. Talking to others and reading some things really helped me.