Pretty obvious why Ye Chenxi is angry, Hua knew about her interest in Chu Qing and deliberately hit on and later slept with him not long after their very first meeting.
All of this after being told in full confidence about him and requesting a favor, it's like becoming intimate with your s/o for months only to find out your friend became a fuckbuddy in secret after you introduced them. But no one should really care anyway since this story will gloss over it smoothly despite being a reverse world, where its essentially "1 woman with 3 men" and the social viewpoint that would occur in this situation.