Li Yifei and Xu Yingying once encountered Cao Bin by chance while they were out shopping. By that time, Xu Yingying had already introduced Li Yifei as her husband, yet Cao Bin still pursued Xu Yingying at this point. It was a clear sign of disregard, and even provocation.
If Cao Bin was the arrogant type who believed himself to be far superior to Li Yifei, and paid no attention to him, then so be it. However, Li Yifei felt that Cao Bin wasn't the showy type, and now to act so ostentatiously, there must be something amiss with such abnormal behavior.
If Li Yifei went straight to Xu Yingying now, it would easily make her overthink. With the security guards spreading the news, many in the company would soon be aware of it. Approaching her now would make it too obvious that he was confronting Xu Yingying.