You become an empty for me.Therefore, it has no effect because I would be interested in you.And there is no reason why I would have to forget what you do to me.
You become worthless for me already. I It was therefore no reason for me to be interested in your results. And it is why I have to forget what you did to me.
You become a useless thing for me therefore. It is no reason why I should care about the result you and it doesn't make sense that I have to forget what you did to me.