Si Yuchen steadfastly refuses to reveal anything regarding their son's health status to Gu Xiaonuan; Gu Xiaonuan believes that this is Si Yuchen intentionally withholding from her.
The less Gu Xiaonuan knows, the more worried she becomes.
She's worried about any sudden changes in her son's condition and feels she can't leave here even for a moment.
Let alone divorcing Si Yuchen, that seems utterly impossible.
Everyone has someone they can't let go of; for Gu Xiaonuan, it's not the man who's hot and cold with her, Si Yuchen, but her adorable son who, since birth, has been apart from her and gone through so much.