My friends: "What that person did to you was fucked up."
My parents: "That person was horrible and manipulative, and what happened to you was not your fault."
My therapist: "This behavior you're describing sounds a lot like gaslighting."
The nefarious specter of self doubt: "Okay, but have you considered that people are only believing you because they haven't heard The Other Side Of The Story? Are you sure that you haven't manipulated them into siding with you?"