Take This Waltz (2011) on Netflix

While on a plane ride back to Toronto from a writing assignment, Margot meets Daniel, a handsome stranger. An immediate attraction is formed and Margot is able to open up and discuss some of her fears and longings. A taxi ride back home causes Daniel and Margot to realize that they are neighbours and Margot admits she's married. The summer-time heat and her increasing fascination with the handsome artist who lives across the street starts getting to her, and Margot is no longer sure if she's happy in her marriage or if she'd be happier with her fantasies with Daniel.