The Ex-wife is Back: Please Let Me Go

*Three years ago, she "unscrupulously" killed the woman he loved the most, namely, her sister. She "scrabbling for ideas" to marry him and became his wife.
Everyone said that she had a heart of a snake and would do anything to achieve her goals.
In this relationship, he had spent a great deal of effort to torture her to the point where she couldn't even be considered a complete corpse.
He had tormented her to the point of despair and hoarseness.
But when she finally decided to give up everything and let go of him, what was the matter with him?