Episode Nine, "The Better Half"
Don's still mourning the end of his affair with Sylvia, so what does he do? Instead of reconciling with his own oblivious wife, he goes the other route, hopping into bed with his newly slimmed down ex-wife while the two of them are upstate visiting Bobby at camp. There was nothing sweet or romantic about it, as these two have been worlds apart for years – even before Mad Men began in 1960. If anything, it proved how much Betty has wised up to her former husband's sexual patterns, lamenting Megan's sorry predicament: "That poor girl," she says. "She doesn't know that loving you is the worst way to get to you." By the next morning, Betty presents herself as the valedictorian of the Don Draper school of "This Never Happened": She is happily eating breakfast at the rustic motel diner with Henry, coldly ignoring Don as he's relegated to a single table.