Before Shen Mianmian could speak, Ruan Yiqian added, "Mianmian, actually, with your intelligence, you should understand that after you graduate, you'll have a good job, and now you have some savings. Returning to Licheng, no matter which family you marry into, you'll have a good life. There's really no need for you to wade into the muddy waters of the He Family. You and Xiaonan being together might not be good for either of you. If you two separate, both of you would be much more relaxed."
Ruan Yiqian's thinking was quite simple: in his view, it was better to marry someone suitable to avoid a lot of trouble in the future. For instance, if Cheng Xining married He Nan, it would save He Nan a lot of trouble.
If Shen Mianmian left He Nan, she could also save herself a lot of trouble.