In real life, people would usually be attracted to more outstanding and attractive people. This was a normal human psychological phenomenon. In "Only Thirty", Gu Jia was a very outstanding person. She was smart, intelligent, independent, brave, and caring. These qualities made her a goddess in the hearts of many people. However, even though Gu Jia had a perfect persona, she could not completely stop her husband from falling for other women. This was because everyone's feelings and thoughts were independent. They might have their own judgment and choices. Even if Gu Jia tried very hard to control her feelings, her husband might meet more attractive women under certain circumstances and become interested in them. In addition, the plot of Gu Jia's husband falling in love with other women in the novel could also be a fictional creation technique to highlight Gu Jia's character image and enhance the plot of the novel. In real life, we can't predict and control everyone's feelings and behavior, so we need to respect everyone's choices and feelings and not judge and blame others easily.