The apartment meant so much to Beckett and seeing she was somewhat upset about Castle’s feelings about it, I was surprised Caskett didn’t talk about it more. So I made up my own Castle explanation.

****I didn’t mean I didn’t like the apartment. Well I did, but I meant that in a structural, physical way. The floor creaks and the walls are thin. I might not miss this place in that sense, but,
Beckett, I will miss it because it meant a lot to you. And maybe even more to me. It was the first place you let me in. The first place we had something real. It may not have ended how I wanted but we actually said what we were feeling. At the time it broke my heart, now though, looking back, it was the best thing we ever did. It led us to here. To now. We are married and we are living our lives together. I couldn’t ask for more. When I said I didn’t like the apartment, I wasn’t talking about experiences or emotions. Those are ours to keep and where we were when they happened does not matter as much as what happened and who were with us. But since I’m a better person because I knew you, I know that if the place means a lot to you, then it should to me too.****

Then they kiss and don’t get interrupted.

Yeah, the last little part makes it fanfiction. A fandom can dream. Of course they get interrupted.