The Other Woman (2014) on Netflix

Forty-something Carly Whitten is a high powered New York lawyer specializing in corporate acquisitions and mergers. When it comes to love and romance, she and her father Frank are two sides of a similar coin: while Frank marries one wife after another, he currently on divorce number five, Carly does not believe in monogamy, she having several casual sexual partners at any given time. Carly rethinks her beliefs on the matter after two months into a passionate and romantic relationship with Mark King, for who she drops all her other boyfriends. What Carly is unaware of is that back in upscale suburban Connecticut, Mark is married, his wife Kate King who believes happily. In Mark and Kate's decade plus long marriage, Kate has forgone all her own dreams and aspirations to be a stay at home housewife, happily supporting Mark in his life, including what has been his lucrative business in developing start-ups. After Carly and Kate meet and find out about the other in Mark's life, each has an immediate reaction based on their own life: Carly, who is not a home breaker, willingly will never see Mark again despite previously believing he may have been "the one", while Kate, who has devoted most of her adult life to Mark, may have a problem envisioning a life without him. Wanting to understand what has happened and in her fragile mental state, Kate turns to the only person who she feels she can and who may have the answers for which she is looking: Carly. At first, Carly is a reluctant support for Kate. Things change when they find out that they are not the only two women in Mark's sexual life...