Most Helpful Girl
Don't delete him from Facebook. That would be showing him that he is important and that he can affect you. Just change your "in a relationship" status in case you have it.
Then focus on yourself. Be at your best. Try to improve yourself and your self confidence. Date other guys and see what's out there.
If he has to come back one day, he will. Just don't put your life on hold and live it the best you can!