Most Helpful Guy
The best thing to get over somebody is to find somebody else to put your focus on. It's hard I know but it can be done.
Most Helpful Girl
You can't just switch your feelings off for someone. Trying to "unlike" someone you have feelings for is like trying to "like" someone you despise... you just can't. All you can do is keep busy and active, and your mind focused on things other than him. Cut all means of contact and gradually your feelings will fade. Every time you find yourself thinking about him focus your attention elsewhere.