Spoiler question

I think she was mentally ill and understandably resented him as she was isolated from her home and couldn’t forget that he killed her parents

+ he had killed so many people to be with her and was about to kill even his own cousin and she couldn’t bear anymore. It’s been a while since I’ve read but I remember line she said went something like “ in the end whatever he did for me in the name of love I resented him”.