If you've got a date planned with another guy but you're really really focused on this one, I might just back out on Guy #2. Then again, if you're not sure of Guy #1's feelings... well, that IS a sticky situation. ^.^ I know how you feel though. Why not write him a short e-mail if you miss him so much, just to see what happens? Nothing too sappy or mushy, just a quick, "hi, how are ya, thanks again for the great evening, ttyl!" Something like that.

Again, good luck, and I hope all goes well no matter what happens.