Elise:
In episode 37, XL told her he can feel what she's feeling... it makes her seem like she doesn't care that he can feel her kissing Jing.
He told her he can feel her heartache. The two of them acknowledge that this isn't something that she can use against him, because she can't control her own heartache. He didn't clue her into the full scope of what he can feel through the connection.
Elise:
In the earlier episodes, when Cang Xuan still had the bug in him, he told XY he could feel XL biting her neck too. So can't she infer XL can feel that physical intimacy she has with Jing too?
I don't remember how their conversation went in the drama, but in the novel XY was confused by ZX's words and distracted by his invitation to come drink with ZX at his wine shop sometime. His words definitely didn't help her realize that a person with the bug in them might be able to feel her kissing another person.
---
Chapter 6:
Xiao Liu laughed “If you died, then the voodoo bug in your body dies. It took me a lot of work to raise that bug, I don’t want it to die.” Xuan looked at him and Xiao Liu poured him water. “I kidnapped Ah Nian but didn’t hurt her and just teased her a bit. Your men tortured me and I also didn’t let you off easy. Xiang Liu used me as a trap but I saved you. Let’s consider it even, okay?”
Xuan asked “When are you removing the bug from me?” Xiao Liu thought and said “When you leave Qing Shui Town.” Xuan’s hands pressed down on the table “Why not now?”
“You have great ambitions and ought to be leaving town soon. When you leave, I’ll remove the bug. This bug has no ill effects other than when one of us hurts the other hurts. So if you don’t harm me, then you won’t hurt. This is to keep me safe.”
“Fine.” Xuan got up and left, and when he arrived at the door, he suddenly turned around “When you have time, you can come drink with me at the shop.” Xiao Liu smiled “Sure.”
Xuan raised his eyebrow and smirked “And when you’re hurt, you might want to restrain your urges.”
“………..” Xiao Liu was thoroughly confused. When did he ever have urges?
Xuan touched his neck and left with a laugh. Xiao Liu stared confused and then after some time he started to smile. Can I really go drink with you? There was a voice that told him not to, but another said that he was leaving town soon, so if not now then he’ll never get the chance again.