
MountainPine:
But did she come to realize this, or did she, as usual, postpone this realization beyond her reality denial syndrome?
CX flat out told her. But it is entirely possible she decided to lie to herself about it. Because later, there's a conversation where XL tells her that he feels what her heart feels. If she doesn't want him to feel her sadness, she needed to not be sad.. or he'd rip her heart or something. lol I think it was when CX got married one time. XL was wearing that dark red costume and came to take her away from the event.

MountainPine:
If she realized that he felt not only her pain but also her other physical sensations, then wouldn't it have been awkward for her to kiss Jing, knowing that Xiang Liu felt it? Would she have cared?
Well, there's several takes on this. I tend to think XY is more often than not, self centered, or self protecting, and doesn't really consider how it makes XL feel. There was a passage in the novel, after Jing married, and when she was really depressed, where she said something about laying there at night, and taking comfort in knowing that she shared her heart pain with XL.
Of course, if you adhere to the substitution theory, then kissing Jing is the only way she can kiss XL. Though, we can see in the drama, that XL didn't seem to see it that way. ;p

primaspe:
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?
I thought it was clear, and that she understood what he was saying, but with XY, who knows? But yes, as I said above, XL explained he could also feel her emotions, later.