In the episode "A Lock-In, a Weather Girl and a Disgusting Habit," Mary helps with a church lock-in party while George does his best to avoid spending time with Brenda. During the course of his struggle, accidentally sees his wife laughing and having a secret smoke with Pastor Rob.
On Reddit, fans of the show accused the writers of including the scene, and the overall storyline of Mary having a crush on Pastor Rob, to explain George’s impending infidelity. Many redditors also voiced the opinion that there is never an excuse to cheat, no matter the circumstances.
However, some users had a different take, extolling the writers for adding depth and nuance to the couple's story and the honest depiction of how messy the gray area of infidelity can be. Regardless of your stance on the matter, fans of “The Big Bang Theory” know exactly where this storyline is headed.