Excess Flesh (2015) online

Jill is obsessed with her new roommate Jennifer, a promiscuous and sexy hotshot in the LA Fashion scene. New to the city and recently single, Jill is unable to keep up as she binges and purges to stay thin; eventually hating herself and everyone around her. Her jealousy and rage spiral out of control -- Jennifer has everything, and Jill wants to be just like her. If Jill can't BE Jennifer, she must destroy her.