Who's at fault???

The problem is he did take pictures of the accident scene. I know he wrote down my licence number and has my name, cell and address. I panicked when he said he was a lawyer so when I agreed to give him the cash, I gave him my info as well. I didn’t give him my insurance information though. The next day when he called for the cash and I said I would rather go through insurance, that’s when he said he would get a lawyer to come after me and mentioned that he was going to the reporting center the next day. So if he reports it and I don’t, that’s illegal. Thus I have to report it. I didn’t have a camera of my cell on me so I couldn’t take any pictures.