Since he only "suggested" that restaurant, why don't YOU "suggest" another one and see what he says? If he gets all upset and nuts about it, that might tell you something.

I'd sure like to know why he'd want to go there, after he talked about her in his drunken state and now all of a sudden you find she works at that restaurant!

Hmm Yeah, I'd definitely suggest going to another one. LOL
Then if he DOES make an issue out of it, he'll have to tell you WHY. Of course you have ammo that he probably doesn't realize he told you about. LOL
I'm not advocating starting trouble, but it DOES sound a little fishy. There might not be anything to it at all. I hope you have a really nice 10th celebration. God bless and please take care! Hugs, Lee