My Best Friend's Blind Date Is Actually Her Ex-Boyfriend?

What would you do if you found out that your best friend's blind date was your ex-boyfriend? Should it be made clear? After all, that happened ten years ago. What if people no longer care about that part, I said, and they just broke up? But what if I don't say it and it will be awkward when we meet in the future? Oh my god, what should I do?