That chapter made me think about my hubby. I was feeling kinda low because of my actual situation (no job and super weak due to my disease) and hubby called me and just thank me out of the blue. Then he tells me about his friend who just spent 1h complaining about how her significant other just brushed her off, saying she didn't have the strength to hear about her problems. After the call, he realized that I always make myself available to hear about his problems, even if I'm not in the mood. He felt so lucky to have me in his life. And hearing that what I thought wasn't enough was actually enough for him really made me cry.
All of that to say that, we cannot judge objectively our impact in someone's life. Just like Xiaoyu think she isn't pulling her weight in this relationship, maybe, for Mu Ye, she's doing exactly what only she can do.