"I caused this mess and I'll take care of it. Don't bother her anymore. She has many friends in Tung City who can take care of her without your help. Consider this matter settled. You didn't think of getting her back when you lost her, so just pretend she never existed. For you, me, or her, this is already the best outcome."
The only thing he could do for her now was to minimize the damage when things were worst.
The demon in his heart was pushed back in the end, sealed in the filth of his blood, rotting together with him.
If she could live in the sunlight, carrying a secret that couldn't see the light of day by himself was actually fine. Loving someone isn't about dragging her down to die, but making sure she can live well is more important than anything else.
But he couldn't see her in the end, for if he saw her once, he couldn't resist anymore. He almost ruined everything, but luckily, it was still not too late to back down.