I Give it a Year
(2013)

Despite loving each other, and trying desperately to work on their marriage, Nat (Rose Bryne) and Josh (Rafe Spall) realize they are not compatible together as a husband and wife. They agree to mutually divorce on good terms and go after who they truly have a connection with.

Nat ends up with Guy (Simon Baker), while Josh ends up with his ex-girlfriend Chloe (Anna Faris).

Thanks Spectre!