I was molested as a child by my babysitter. His wife was aware and complicit. She would sleep on the couch so I could sleep in the bedroom and be molested.
I think every pedophile deserves to be brutally murdered honestly.
If I had reason to believe my SO was touching my child I would do all 3 things simultaneously, confront him, kick him out, and call the cops. I would not ever see him the same again.