The Truth About Love(2005)

How far would you go to test your man? How far would you go to keep him?

As part of a drunken bet with her sister Felicity, happily married Alice sends an anonymous Valentine's card to her husband Sam to see if he hides it. When he does, what was a prank leads to a series of events and revelations that may put her marriage at risk, and leaves her looking for answers.