It was up to him to save her. He wanted to let her die, Just to prove a point.
To show that there was no good in him, He wanted to prove he was evil. As she lay dying, She told him what she could see. "A man capable of love can be saved", She told him genuinely.
He didn't want to believe her, For she must be crazy in his eyes. No matter what he thought, He saved her, He had always loved her. That clearly showed, He wasn't evil after all.