Best Friends Pull the Trigger

Casey and Matt have been friends since grade school, but when high school comes, things change. Matt becomes one of the popular kids, and Casey becomes an outcast. He ignores her when he sees her in the hallways at school. And she pretends that they never were best friends.
But when Matt sinks to his lowest point, none of his "real" friends are there. Casey is the only one who can help him through his fight with drug addiction.