I sent my ex to prison
Why did you send your ex to prison?
Because he has an annoying face
Prisons are necessary, as people who break the law need to be punished for doing so.  However, it sounds like you got him sent to prison for having an annoying face.  That's definitely a miscarriage of justice!
That's fair. I think he should have suffered from it.
Someday your story will fall apart and you will be the one being sent to jail. It would be easier to just confess what you have done and get it over with now. Your ex is suffering and you need to right it.