Why did Faye Wong and Na Ying become enemies from good sisters?

Speaking of the leading figures in Chinese music in the 1990s, we can definitely think of Faye Wong in Hong Kong and Na Ying in the Mainland. They were also good sisters in those years, but the distance between them was caused by Na Ying's attitude towards Nicholas Tse.

Na Ying and Faye Wong were very good sisters, and they often corresponded with each other. Until 2000, the relationship between Faye Wong and Nicholas Tse was exposed by the media. Na Ying was blunt in an interview with the media: she was not optimistic about this relationship that the woman was eleven years older than the man.

The friendship between the two people has also completely gone in another direction. Since then, it is difficult for them to present at the same time, and they are silent with each other.

Later, the relationship between Faye Wong and Nicholas Tse didn't go sour, and they fell in love and broke up for no reason. Later, after two unhappy marriages of Dou Wei and Li, Faye Wong rekindled her old relationship with the divorced one.

Na Ying, who was not favored by the two, also experienced the love between older girls and younger boys. In the end, Na Ying declined and became famous. As usual, Faye Wong and Nicholas Tse finally got together. I wonder what Na Ying will think?