When Tessa is sitting at her computer looking at her and David's wedding photos, the photos are Katherine Heigl's actual wedding photos from her marriage to Josh Kelley. This is why the photos do not show the groom's face.
Kate Hudson and Kerry Washington were originally in negotiations to play the lead roles, but Washington signed on to star in Confirmation (2016) instead. Katherine Heigl and Rosario Dawson were eventually cast instead.
Katherine Heigl had never seen Fatal Attraction (1987) prior to doing this film, so she tried sitting with it one night but had to stop 20 minutes in because it was too creepy to watch before bed. Her goal was to not play the same character but to have the same impact.
Amma Asante was initially set to direct, but she left the project when Kerry Washington declined one of the lead roles. Denise Di Novi took over, making this film long time producer Di Novi's directorial debut.