How can I speak out about what my ex has done to me

I want to… pretty much blast him by telling my experience with him and if you think this is Petty, his intentions (in his words) were to get me hooked on drugs and prostitute me out.

There was a girl that I briefly met that he was trying to do this with, but (again in his words) “she was too fat and nobody wanted to pay to fuck her” she was a homeless girl he picked up off the street under the guise of “helping her.” And when he couldn’t literally sell this girl he robbed her of all of her belongings and dumped her back out into the streets hooked on drugs.

I did not know any of this until way later, until the abuse started with me. He had me under the impression that she was his child’s mother’s friend. Yes I’m an idiot. I know. He admitted all of it to me, and there is so sooo much more.

And someone told me I need to be careful if I have no proof because he could legally hit me with slander, even though this is my real experience and my story to tell. I don’t speak out for a long time after leaving because I used to be terrified of him. Looking back, he had just gotten into my head really good and he’s a small little man. He did get me on drugs, he did attempt to prostitute me out, He’s a danger to people and I believe the world needs to be warned about him. I have been sober since I left him.

I am not the only one, and I’m sure there’s been more since and will continue to be more. I want to speak up and scream it at the top of the world.