What are the recommendations for novels where the male protagonist thinks the female protagonist is dead?

In the novel, the male protagonist thinks the female protagonist is dead I read it a long time ago, but I don't remember it very clearly. The male protagonist thought the female protagonist was dead (everyone thought she was dead); The female protagonist had a misunderstanding about the male protagonist because the female supporting character seemed to have. Moreover, the day the female protagonist died was the day the female supporting character gave birth. The male protagonist was in the hospital. The female protagonist called the male protagonist for help. The male protagonist thought that the female protagonist was going to argue with him again, so he hung up the phone. Later, when the female protagonist came back, she felt uncomfortable when she saw the child. It was unknown if the supporting actress was married to the male protagonist and had a son by her side, so everyone thought that the child was the male protagonist's. Moreover, the servants of the male protagonist's family respected the supporting actress and thought that the supporting actress was like the female protagonist. In fact, the male protagonist only loved the female protagonist and did not love the supporting actress. The male protagonist built a garden for the female protagonist and named it after a character in the female protagonist's name. The two characters [X Garden] were also "buried" in this garden. In the few years when the female protagonist "died", the male protagonist had been abnormal. It seemed that he was normal during the day, but at night, he would have hallucinations that the female protagonist was still alive. There was a time when the male protagonist walked barefoot in the snow at night, reminding the "female protagonist" behind him to step on his footprints to avoid falling. It's a modern language. I forgot the title of the book. I've been looking for this novel. If you've read it, please let me know. Thank you!