Someone Like You (2001)

Jane Goodale has everything going for her. She's a producer on a popular daytime talk show and is in a hot romance with the show's dashing executive, Ray. But when the relationship goes awry, Jane begins an extensive study of the male animal in an attempt to understand how and why Ray has so suddenly and inexplicably jilted her. Turning to Freud, Darwin, her own lovelorn friends, and a cabinet full of theories, Jane begins a safari of sorts to track down the strange lair of the human heart. Along the way, she puts her "studies" and romantic misadventures to use as a pseudonymous sex columnist--and becomes a sensation in the process.