There are many movies that deal with the theme of secrets in marriage, so it would be helpful if you could specify which movie you’re referring to. However, in general, movies that explore this theme often involve one or both partners in the marriage keeping a secret from the other, which can lead to tension, misunderstandings, and ultimately threaten the stability of the relationship. Some examples of movies that deal with secrets in marriage include “Gone Girl”, “Eyes Wide Shut”, “Unfaithful”, and “Blue Valentine”.