Castle: You know what? This isn't about your mother's case anymore. This is about you needing a place to hide. Because you've been chasing this so long, you're afraid to find out who you are without it.
Beckett: You don't know me, Castle! You think you do, but you don't.
Castle: I know you crawled inside your mother's murder and didn't come out. I know you hide there. The same way you hide in these nowhere relationships with men you don't love. You could be happy, Kate. You deserve to be happy. But you're afraid.