The Key (2014)

Jack and Ida, a disillusioned Los Angeles based married couple have been married for 16 years and mostly stopped communicating. This void is particularly troubling for him in terms of their sex life. One day she finds a diary of his sexual fantasies, which he accidentally left available for her to view. And yet she refuses to read it, if only for the reason that out of spite. For the same reason, she herself begins to keep a diary, hoping that he will find and read it.