
HeadInTheClouds:
Jing, more than anyone, had a front row seat to the Xiang Liu/Xiao Yao's relationship. This was very clear in the novel.
Your interpretation of this will depend on how you view this love triangle.
Have you read the novel, or is this purely from the drama?
Yes, I have, but quite a while ago though. I know that Jing had 'the front seat', but I meant that it always surprised me how shockingly ignorant XY was. She knew Jing loved her, and she cared about him but didn't think that her feelings for XL would/could hurt Jing.
On the other hand, she did try to downplay the meaning of the Voodoo King's words (as if she didn't realise that Jing already knew everything about her feelings).

HeadInTheClouds:
In the drama, Xiang Liu never drew blood from her neck once she became Xiao Yao.
Well, yes, not in the drama, but he did in the novel.

MountainPine:
I share your vision on this.
Just think of the moment when, already on a late stage of the relationship between Jing and Xiao Yao, he suddenly discovers that she is still preparing poison for Xiang Liu. He asks her anxiously about it, and she is like: "Yeah, so what?" And then she is completely indifferent and ignoring his emotions at that moment. She does not even try to reassure him in any way.
That! That's what I mean. What a good example! And your question re: what XY knew about the bug connection and what XL could feel through them is spot on. CX did mention to her that he could feel her arousal, but in some way that was part of biting and blood drinking. Did XY assume CX would feel the same if that was a normal kiss (or more) without any biting? I think there was no any other moment in the drama or novel that would confirm XY's knowledge?