I recorded my bfs confession over the phone[TW: he’s a p3do]

Hi, I’m 20f and my boyfriend of about a month confessed to me that he’s attracted to children, wants sexual relations with children, and has had sexual relations with a 12 year old over the phone… and I illegally recorded it. He’s good at covering his tracks, I know he is. He’s also good at lying and gaslighting. If I didn’t record it, he would’ve convinced me that it never happened. I want to protect children and I want justice for any child he has harmed, however my only bit of proof was obtained illegally.

What should I do?

Location: Washington state, USA