What happens if he reports? Does that mean you have to make a complaint yourself or talk to the licensing board or something? Does the info become public?

TBH I think it's best that this very inappropriate behavior gets reported. If he talked this way to you, he might have done it to someone else or he might in the future. If a report is filed it may prevent him from harming another client. Or if he does, it might help that client get taken seriously.

I know it's probably traumatic to revisit this situation but it could really be for the best.