Traveling To The Past

Kimihiro Watanuki goes in the storage room to get some sake and then he saw a book with a butterfly design on top. He asks Mokona about the book and he said that the White Mokona told him that when Yuuko holds that book, Yuuko always cried. Then Watanuki wants to find about Yuuko's past that is why he wants to travel back in time. Is he still going to wait for her after the events?