What kind of mentality should I use to face the promotion of my best friend?

Zi Xuan and Willow are classmates and good friends. They went to the same company for an interview. They went to various departments to go through the entry formalities, reminded each other of the training time, and got along well. Their daily work is familiar with various businesses under the leadership of Wang, director of the marketing department, and the internship salary they get is roughly the same. Just after the probation period, the department began to evaluate the performance of the newcomers. Zi Xuan is good at communication, optimistic, popular and has a strong professional level. He quickly surpassed willow and other colleagues and successfully completed the company's assessment indicators. Director Wang also looked at Zi Xuan with new eyes. After half a year, Zi Xuan was promoted to business director because of his outstanding work performance. Zi Xuan invited the young people in the department to dinner with the commission bonus, and everyone was anxious when they were happy. His outstanding performance has become the object of praise and a strong competitor of Director Wang at various conferences. With the continuous improvement of Zi Xuan's performance, Willow gradually moved away from Zi Xuan and became strangers with his former best friend. Willow is too self-abased to work under her best friend, and her working condition is getting worse and worse. Soon, the director above realized this problem and talked about Liu Ye's focus on self-improvement for better development. Realizing his mistake, Willow changed her mind in time, took the initiative to undertake the work in the subsequent docking task, and cooperated with Zi Xuan, which was unanimously recognized by everyone and reversed her inferior position.