Daughter was sleeping with her teacher

My daughter is 16 and has autism and had been having a relationship with one of her teachers who is 36 and MARRIED with two kids! We found this out a few weeks ago because one of her friends told the principal and stole my daughters phone to show him. He was arrested and we were alerted. She has been losing her mind the last few weeks and I just have no idea what to do anymore. She was crying because she feels like she ruined his life and he loved her. No matter how many times I explain to her that this man did not love her. He loved the power he had over her. She has been crying and asking why we would do this and saying he's the only one in her life that loves her. It's all been one big mess and I can't get her to understand what she had wasn't love and idk why she thinks the rest of us don't love her