It was revealed in "Chuck Versus the Subway" that Casey began eating at the diner where Alex worked in order to get to know her better, but did not reveal his identity until after Shaw resurfaced.
It was revealed in "Chuck Versus the Subway" that Casey began eating at the diner where Alex worked in order to get to know her better, she tells Casey she doing well in her Criminal Psychology course. Casey did not reveal his identity until after Shaw resurfaced.