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!?!?!?!?!?