Girls in love can be contradictory. Even though she verbally dismissed the idea of Su Chaoyang visiting her in the hospital and didn't want others to tell him about her hospitalization, deep down, isn't she still hoping that Su Chaoyang would come to see her?
If she were to be admitted to 301 Hospital and Su Chaoyang came to see her and ran into Du Mengxin, wouldn't that simply provide them with an opportunity?!
Of course not!
Li An'an spent half a day with her, had lunch, and then left. Before leaving, Mu Xiangwan kept insisting not to tell Su Chaoyang about her hospitalization. As Li An'an listened, it seemed more like a hint to leak the information on purpose.
When lovers have a disagreement, often both of them find it hard to back down. At such times, the best person to mediate is a close friend with good relations with both. As long as someone can mediate, if one side softens, the disagreement can be resolved.