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There is no such thing as pop-psychological closure. Imagine if the perpetrator of a mugging and homicide explained that he killed his victim to experience a sense of closure. What would the purpose of "closure" for the LW, given her husband's secret affairs? To eventually set aside the awareness that humans believe they are better than they are. Closure in death means going gentle into that good night. But should everyone have a neat bow-tie tied around their coffin for the sake of the survivors?
There is no such thing as "working through grief." You cannot "work on your feelings"--whatever that phrase is supposed to mean. To some extent internal feelings can be influenced through activity, but to a great extent feelings are involuntary. They will work themselves out.
About the best one can say is, "life goes on."