BMW: why...?

Jiang changed completely. She broke her ties with the Destined One, just as Buddha would have done, according to her. She corrupted the concept of achieving enlightenment and is now capable of inflicting terrible curses on others.

All of this is to protect the dragons from the gods and other threats. She will never let any dragon die again. In her past life she already lost everything, including her kingdom, and now she does too. There's no point in maintaining ties if you feel empty and full of hate.

It pains him to see how his best friend, for whom he already has feelings, is no longer the same as before and is now capable of anything, even killing him. Since she no longer has ties to anyone, she doesn't feel sorry for him, not even a shred of love...or maybe she does?