Louis: The paternity test showed me that some part of you thought you might still have a choice to make, and I needed you to see that Chuck would always be the wrong one.
Blair: Louis, I don't now how many more times I can say this, but Chuck and I can never work.
Louis: You know that for certain?
Blair: I do. So does he. And so should you. Chuck destroys everything and everybody in his life. And he'll never change. But what's scaring me is that you're changing into him.