Season five had ended on a question of whether Don would cheat on Megan, and we got the answer in the season six opener. Not only does he cheat, but he cheats with their neighbor, Sylvia (Linda Cardellini). Season six finds Don carrying on a full-on affair with Sylvia, and when she's the one to break it off with him, he's surprisingly really attached to her. Emotional affairs are just as bad, Don.
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