Man About Town (2006) on Netflix

Plot summary

Jack Giamoro is a talent agent in Hollywood who has built a career, made money and married a woman named Nina. Somewhere along the way he misplaced himself and let the marriage slide, so he signs up for a class in journal writing to look inward. Two things then break his settled life. He finds out that Nina has been unfaithful with his most important client, and Barbi Ling, a journalist with ambition, walks off with the journal he keeps, a book full of secrets that could damage him both at home and at work.