He loves her, so the betrayal hurts so much
He thought the Su family had betrayed him, so he used humiliation to cover up his pain; he didn't know that the Su family died to protect him.
She loved him, but she couldn't tell him - if she told him, he would know the truth about the destruction of the Su family; she killed people and took blood for him, but she couldn't tell her - if she told him, he would know that his life was exchanged for hers!
