I say, let him wonder for a bit. Stick that in your pipe and smoke it, buddy.
I think it's not a bad thing you went out-- you just confirmed you weren't ready to move on yet. No harm done. And I'm sure getting asked out boosted your ego (it did me). It's good to know you could date if you wanted to, even if you don't (want to).
When I had coffee with the guy who asked me out, it was icky too. And then it turned out he was married! Our parting communication was a DB lecture from me.
