Dont let me go: Larry Stylinson

Louis and Harry were best friends and that was all. One day, one of them just got up and left, leaving the other with nothing. He left. They fight. One loves, and one hates. One would do anything for the other. What happens when the truth comes out? What happens when they finally figure it out? What happens when everything comes crumbling down more than once? Will they get the ending they want or will it be ruined forever?