Man About Town (2006)

Hollywood agent Jack Giamoro (Ben Affleck) has a ruthless dedication to his work and a tendency to neglect his wife, Nina (Rebecca Romijn). Upon discovering that Nina has been sleeping with an up-and-coming actor, Giamoro enrolls in a self-help course and begins keeping a diary. But, when that diary, with its tell-all account of Giamoro's professional and personal turmoil, falls into the hands of freelance writer Barbi Ling (Bai Ling), he struggles to retrieve it and prevent a massive scandal.