That kind of balance is why it's important for ideally both parents to be present in a child's life. Rarely is anyone as socially aware as Xu Qing, the best they can do is notice and cover for their spouse.
Misplaced feelings aside, I do like that Gigo genuinely has no interest in her, even if she is basically a twin to Roji. He's handling it to the best of his teenage ability.
These are kinda pessimistic, I'm on my second read-through and I saw it as him demonstrating to her that he is willing to listen to her openly. Considering Xu Qing's mental skills this is well possible