Beckett: It’s time to say goodbye.
Castle: I’m not leaving.
Beckett: Castle, you promised that you would help me with something when the time came. This is it.
Castle: Beckett, no.
Beckett: Please, Castle. Please don’t make this any harder than it needs to be.
Castle: I-I wish I could kiss you. I wish so many things.
Beckett: No. There’s no regrets. All in all, I think we’ve had a great run. You should go. Rick. I love you.
Castle: I love you, too.
- Castle Season 5 Episode 21 - Still