Marc's relationship with Betty is largely adversarial, and he frequently insults and humiliates her, often with the help of Amanda. As time passes however, and their professional positions become more aligned, their relationship develops into a simultaneous rivalry and camaraderie. When Wilhelmina temporarily becomes Editor-in-Chief of "MODE", she spitefully lures Betty (who had left with Daniel) away from Daniel and back to "MODE". However, when Wilhelmina begins to see potential in Betty, Marc felt betrayed and gives Betty a sack full of letters to shred. It initially appears he is demeaning Betty, but Betty learns the letters are Daniel's previously unseen fan mail. Their discovery results in Wilhelmina's demotion to Creative Director and Daniel's reinstatement as Editor-in-Chief at "MODE"—and Betty's reinstatement as his assistant. Marc admitted to Betty he was motivated to show her the letters out of jealousy.