What keeps you adrift on the sea? The questioning of best friends in O'Hara? Disappointment in the Navy? Or zero? Maybe both. But there is no doubt that zero is definitely the most important reason.
He knew that he was a wandering seabird on the sea, and she was the sea that he could not leave. Therefore, he knew that she was poison, and he was happy with it.
For Zero, the former Vice Admiral Kuzan was an opportunity. Without him, maybe she would still come to the sea, it was just a matter of time, but she might also continue to suppress herself and live an ordinary life on the island. The appearance of Kuzan undoubtedly gave her a second way to go, a second choice. It was precisely because this opportunity came at the right time that even for many years, Zero didn't know her feelings for him.
[The human heart is not a calm pond, nor an pastoral lake in the woods. It is an ocean that harbors undersea plants and terrifying inhabitants]