L'Enfer (1994)

Paul, an irritable and stressed-out hotel manager, begins to gradually develop paranoid delusions about his wife's infidelity. As he succumbs to green-eyed jealousy, his life starts to crumble. Each step on his downward spiral to madness seems to accelerate, driving him further along the path to a personal hell. Finally, the former shell of his personality cracks completely, with tragic consequences.