Wrath's shoulders square with tension when she does call him as such. He is limited on what he can tell her based on the curse, but there was some information he kept entirely that he could have shared.

"I wanted your choices to be uninfluenced by the choice I made to save your life, which binds us for eternity. But even in the bond itself, you have a choice. You can refuse."

There was no time to explain to her the consequences of the mark he left on her when she most deserved to know (before he bound them together with the mark upon her neck). She was dying. He asked her decision, and she said yes without fully knowing what she agreed to. Something dark explodes inside of him, and it only briefly crosses his expression- hurt and anger, pain and frustration.

"I asked you to live long enough to hate me for this. So hate me for it."