I also think telling the escort that you know some personal information is a good idea in this situation. If I were in his shoes, and after a certain number of hours you accidentally blurted out something about me, I would feel a bit creeped out - I would wonder what else you know and why you were holding on to that information. I imagine you might feel uncomfortable/slightly stressed if you were trying to keep something to yourself. Yes, you may risk him having a negative response, but that's his business and not yours. As we all know, privacy isn't what it used to be.
I'm also not saying that disclosure is appropriate in every situation. I've known more about many of my clients than I've let on, but it doesn't bother me to know, and it's unlikely to change how I interact with the person based on what I learn.