Esposito: So... Castle's last case, huh?
Beckett: Mm-hmm.
Esposito: Ryan and I thought we'd do a little going away party.
Beckett: Yeah. Well, it's not like he's leaving forever.
Esposito: You sure about that? Why do you think he's been following you around all this time? What, research? The guy has done enough research to write 50 books. Look... whatever the reason is, I'm pretty sure it doesn't include watching you be with another guy.
Season 3

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