When Alicia discovered that Kalinda and Peter slept together
It was already difficult for Alicia to return to the professional world after taking more than a decade off to raise her children, not to mention carrying the private pain and public humiliation that followed her husband's scandal. While finding her stride at Lockhart/Gardner, Alicia became very close with the firm's private investigator, Kalinda. After spending days working side-by-side and nights putting back tequila shots and swapping personal stories, it meant a lot for Alicia to finally have a true friend. That was until she found out that Kalinda had slept with Peter just a few years prior.
Watch "In Sickness" (Season 2, Episode 21) on CBS All Access.