Most Helpful Guy
To forget someone time is the most effective thing. Though you can shorten that time by completely remove any things related and remind you of him. Delete him from your life. Meanwhile, find a hobby, something to distract you. Live your life and boom you've done it. Do not give yourself time to ruminate. And most importantly you make peace with yourself that this is over and look at the future lad. The future is bright ;)
Most Helpful Girl
Time will fix everything. Focus your mind on something else, think of the negatives with that person, just look ahead.