I don't think you ever forget about the hurt, but you can put it in the back of your mind and not let it rule your life anymore. Don't talk about it to anyone; don't think about it; and for goodness sake don't dwell on it day in and day out. If you do that, the hurt will stay with you forever. You really do have to forget it and move on with your life.
Try to see a counselor or therapist if you need to talk it out, or get a notebook and write your thoughts and harsh feelings down. You can keep the notebook or burn it, but the feelings and thoughts will have been sifted out of you and onto the paper. That will help. Forgiveness is the next big step, but to completely forgive, is often completely impossible for those who have been deeply hurt.