How the Emperor trapped a Witch

"Did you really think that it was going to be easy to get rid of me?" he raises an eyebrow as I was pushed against the wall. "There isn't anywhere you can go without me following you."

I was isekai'd into my little sister's novel as the evil Witch that tortured the Male Lead as a child; however, I did not follow that path- I took care of him then sent him off to save the world: he was supposed to have found his Soul mate on that journey and lived happily ever after..... So WHY is he here now!?!?!?!?!?