What is the ending of the secret dialect that mystery novels can't speak?

That man is with that woman. In the novel Unspeakable Secrets, Ye Xianglun gave up everything in the future for Xiaoyu and returned to the past before Xiaoyu first played the piano. Ye Xianglun is the only one who knows about piano crossing. In order to be with Xiaoyu forever, he chose never to return to the future and stay with Xiaoyu forever.