The Art of Losing a Friend

Yes guys, I have, I have lost a person who I thought would be one of the biggest parts of my life as a friend!! it hurts. It hurts too much. how do I survive? Moments where we bitched bout' those few pick-me girls in school have turned into moments where I am alone looking at him with another girl having the same conservation and laughing their lungs out. should I win him all over again? or go with the flow of life?