Looking for a movie. it was european, maybe german or norweigan. a guy picks a girl off the street

She was about to kill herself... he thinks she's a prostitute. he takes her home. he plays cruel mind games with her. he straps her into a dentist chair or something like that and threatens to plants drugs on her and call the cops. they make up... then they eat sushi and screw. then she takes a bath, appears to slash her wrists and die. he tries to bury her but can't finish digging in the rain. she's actually alive comes back in anyway. he's driving her home in the morning and she pulls on the steering wheel, she flies out the windscreen and dies, he's left stumbling around in shock.

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