House then spends some time in his office staring at his empty white board before heading to Stacy's office. She tells him that she has made a decision: she's leaving Mark for House. "Don't do it," House says. Stacy can't believe it; House wanted her for so long, and now that he has her, he doesn't want her anymore: "What changed?!" Nothing did, House says; that's the problem. Mark will change for Stacy and do whatever it takes to make her happy. House either can't or won't. Their relationship will end just like it did before. "It doesn't have to be --" Stacy starts. "It does," House finishes. "I'm sorry, Stacy," he says, and leaves. Stacy just stands there will her mouth hanging open as much as her surgically tightened skin will allow. It really sucks when you're so used to everything going your way and then it doesn't, huh, Stacy? Maybe House was being all self-sacrificing and noble by sending Stacy back to Mark because he loves her so much that he wants her to be happy even if it isn't with him. But I prefer to believe that he stills hates her for cutting up his leg and this was his revenge.
The Cottages take bets on how long SuperMom and StuporDad's marriage will last. Foreman thinks it'll last forever: "There's nothing to fight over if you never talk about anything." Hey, boredom can end a marriage, too.
Wilson sees Stacy packing up her office for good. Hooray!
Wilson then finds House hanging out on the roof and asks him what House told her to make her leave. House says he told her she was better off without him, and whips out his Vicodin bottle to dry-swallow a couple in Wilson's face, just to piss him off some more. Wilson goes into psychoanalytical girl mode and accuses House of sending Stacy away because he likes being miserable because it makes him feel special. House doesn't want to change that by letting someone into his life who could make him happy: "Being miserable doesn't make you better than anybody else, House. It just makes you miserable." Ah, but it also makes you a popular television character and nets you a Golden Globe.