Because I still love you.
Nothing hurt Tesarius more than the revelation he made to himself. Yes, he was still madly in love with her, even after everything he found out.
Even after knowing what Rovamer was up to, what happened to his child, to Sera, and to Mertyll. He still loved her. and he believed that was why he ended up in this mess in the first place.
So there he stood, his hands pressing down on his wife's neck, yet not able to apply the needed pressure to end everything once and for all. And as he trembled there before her, Aurora stared back at his eyes, tears gathering in her golden ones as she trembled and clawed at his hand. But the trembling was not only because of the pain coursing through her neck, but because of the look of utter hate in her husband's face.