If Jiang Yao did end up dating another guy and Lu Xingzhi broke them up forcefully, Jiang Yao would definitely have hated him to her core. So, in order to be with her eternally, the only way was to marry her.
They stopped pestering Jiang Yao after they learned that the phone was a gift from her husband. Although it was normal for a husband to give a present to his wife, they speculated that her husband was from a wealthy family, and that he wasn't the frugal type of husband and was willing to shower her with expensive gifts. Their first impression of Jiang Yao also suggested that she was from a well-to-do family.
The girls were very curious about Jiang Yao's husband, but it was something quite awkward to ask about since they had only known each other for one day.