[a pause as he considers refusing, but why? It's not as though it's a great secret, it's just that he's not accustomed to discussing personal matters. And it doesn't get more personal than his curse.]
Someone who I thought I admired used taboo magic to turn me into this. I thought it was because I wished for strength, but in reality he was just using me as his own personal guinea pig.
[His voice tightens, but his anger isn't directed at her. He can't let go of how he was used and betrayed like that.]