The world

This is right after the undercover kiss they shared. Josh gets wind of it and cheats on Beckett because he feels betrayed. So Beckett breaks up with him and feel empty. She feels as if no one loves her and she means nothing to the world.

They were sitting in her unmarked police car waiting for a suspect to arrive at his house when she finally turned to Castle and said, "Castle, I can't do this anymore. I am sorry."

"What are you talking about?"

"I mean nothing to anyone anymore."

"That is not true."

"First, Will leaves me only to come back two years later and thinks that I still love him and that I waited for him. And then Demming, I broke up with him because I wanted to go with you to the Hamptons, but then you showed up with Gina. I spent hours that night in the bathroom crying. I felt like nothing. And then Josh. He cheated on me. He cheated on me Castle. With some slutty nurse because you kissed me to save the boys. No one cares about me anymore. I mean nothing to the world anymore." Kate said as she broke out in tears.

"Kate that is not true. You mean the world to people." He said.

"Don't lie to me Castle. I don't need that right now."

"I am not lying, maybe to the teller down at the bank, you are just another checking. To the plumber that came today, you are just another house. To the airport ticket counter you are just another fare. At the beauty shop at the mall, well you are just another head of hair. But that is alright, that is okay. If you don't feel important. Then all I have to say is to the world, you may be just another girl, but to me, you are the world."

"Stop Castle. Stop lying to me and yourself. You don't want this. I am just some dead beat cop you write about. I mean nothing to you."

"No, look you may be just another tip to the waiter at the restaurant, another dip to the guy at the ice cream shop. And when you can't get reservations because you don't have the clout, or you didn't get an invitation. Because somebody left you out. But that is alright, that is okay. When you don't feel important, all I have to say is you are the world to me. You mean everything."

"I can't be. I am just one of a million."

"No you are one in a million to me."

"I don't matter to anyone Castle. I don't."

"Look into my eyes and tell me that you can't see, that you are everything to me." He says with a serious attitude and stares into her eyes.

"I see you. I see you Castle. That is all I see."

"Then tell me if this feels like you don't mean anything to anyone." He said as he closed his eyes and the distance between their lips and sparks flew instantly. It felt like nothing they had ever felt before. It was not just fireworks, it was magic.

"Tell me you don't feel anything." He said once again.

"I can't." She said looking down into her lap.

"I know. And you should know that you mean everything to me."

"What does this mean?"

"This means that I love you. So much more that you can imagine."

"Always?" She asks.

"Always." And he responds.