Pusher(2012)

Street dealer Frank goes through a hellish week as his life completely unravels. Naively believing that he's got a sure thing on his hands, Frank borrows money from his supplier, Milo, in order to get in on a big drug deal. When things don't go according to plan, Frank has to scramble to come up with the cash on his own to pay back Milo. As Milo's impatience mounts, so does Frank's desperation. The increasingly frantic Frank becomes willing to do whatever it takes to save himself, and when Milo shifts decisively from mildly inconvenienced friend to mortal enemy, Frank risks losing not only his life, but his humanity. Soon, Frank is beating up his sidekick, betraying his girlfriend and even trying to con his own mother.