From the Dalrock blog, on The Endless Courtship Fantasy:
Fireproof: This is the Christian contribution to the endless courtship genre, and is celebrated as exemplifying modern Christian’s commitment to marriage. Hero fireman Caleb Holt (Kirk Cameron) must convince his wife Catherine (Erin Bethea) not to frivolously divorce him. To do so he undertakes a 40-day test to prove his worthiness to his unhaaaapy wife. While he is doing this his wife is busy flirting with other men, and is no longer wearing her wedding ring. A doctor she is flirting with unexpectedly learns that she is married when the hero arrives at the hospital with an injured arm after rescuing a young girl. From the plot summary on Wikipedia:
As he continues his 40-day challenge, Caleb begins doing more household chores and running more errands for Catherine, and leaves her roses. Caleb even smashes his computer to pieces with a baseball bat in order to remove the temptation of viewing internet pornography. Nevertheless, Catherine, who is led by some colleagues to think that Caleb did all these things with an ulterior motive in mind, is still intent on divorce. When she later learns that the equipment needed for her mother’s medical care has been paid for in full, she arranges a lunch date with Dr. Keller, thinking he was the benefactor. Caleb discovers Dr. Keller’s relationship with Catherine and immediately informs him that he won’t let him have Catherine without a fight. Catherine’s friends misinterpret the confrontation as a threat, but they do not tell her since the Holts’ marriage doesn’t concern them. Dr. Keller (who is actually married) breaks off his relationship with Catherine.
Eventually Caleb completes the test to his whorish wife’s satisfaction, and she gladly takes him back.