The Canyons (2013)

Christian uses his family money to produce movies by day. He is about to start the production of a low-budget slasher flick in New Mexico starring Ryan, the handsome boyfriend of his assistant, the pretty Gina. But, unbeknownst to him, Tara was involved with Ryan a few years ago. Christian, meanwhile, is having a fling on the side with pretty Cynthia, a yoga instructor who used to take acting classes with Ryan.