Nice touch at the end - robber never tells the wife ... *spoilers*
.. that he no longer wants to kill her husband. Perhaps they're trying to tell us that she senses by his demeanor - he seems settled in his mind, not testy, when she ends the relationship, and he peacefully agrees not to tell - that her husband isn't any longer in danger. Or maybe they leave that tension there for a bit, to linger. But I think they mean for us to think that, given the peaceful ending of the film.
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