Miriam, the bullied and the forgotten

Miriam: A girl who randomly got exiled by her best friend Blake and gets abused at home as well. Life isn't easy and nothing seems to be going her way.

Blake: One of the popular jocks at high school that had got good parents and is not too rich but isn't poor. One day he decides to exclude his beloved friend Miriam.

See what happens .
Why did Blake turn on Miriam? Will she ever forgive him?