Did you read the whole story or just jumped some chapters, i feel everyone is missing the point were he also was poisoned with a poison that would make you act aggressive and bring out the bad that everyone is capable of, this happens in his past life and in the current one but in this current one they find the situation and take measures against the poison. So the ending is fair if you pay attention to everything it happens.not just the start and the last chapter.

It's not just that he didn't commit anything, it's her personal values as a woman. Are you really willing to go back to the man that psychologically traumatized you in every way he could possible?