Double Brain Strain
The incredibly sexed-up couple continues to meddle in their friends' lives, now in the Blair/Chuck breakup. See, they've been together for five seconds, so now they're both Dr. Phil. Sadly, the one relationship they can't help is their own, so S sneaks off to see Carter, hiding it from Nate rather than telling him that Carter has intel on her dad's whereabouts. Nate then forbids S from seeing Carter again, daddy info or no daddy info.
Meanwhile, as she rides off to find her father in Palm Beach, Rufus can't find Lily at Canyon Ranch. Surprise, surprise: she opens the door when S gets to Florida.