Broken Vows is a 2016 American psychological thriller film directed by Bram Coppens from a screenplay written by Jim Agnew and Sean Keller, starring Wes Bentley, Jaimie Alexander, Cam Gigandet, Alexandra Breckenridge, and Astrid Bryan.
They have a one night stand, and when she comes back home, he goes into a psychotic rage, imagining that he is in love with her; he even goes as far as tattooing her name, Tara, on his arm.
Her friend (Alexandra Breckenridge) gets a private investigator (Matt Gerald) who finds out that he has had some similar episodes in the past.
In the final scene, Tara and her husband recover at a hospital, but the doctor lets her know that she is pregnant, when the shock is revealed that she is carrying Patrick's baby.
[1] In July 2014, Cam Gigandet, Alex Ladove, Alexandra Breckenridge, and Astrid Bryan joined the cast of the film.