That hell did i just read? I mean, lets ignore the fact that a lil boy pretended, successfully, to be an adult for months... which is absurd.
But u're telling me that she'll have to live knowing her lil student was constantly having sex with her and that the guy she wanted to spend her life with is gone? Thats incredibly f'd up.
Even if she loses her memory of what happened in this period, like finding out was the boy, her beloved boyfriend would still had disappeared from her life. That mage is also a scum to let that happen.
But the worst is that the story ended like that.