I’m so sorry, Snec, but as others here have said, congratulations on having the guts to really go after what you wanted. Not many people are brave enough to do the same.
It’s better that you did that, than to have just not done anything and wondered how things could have been for the rest of your life.
Sorry it didn’t work out, though.
You did what you had to do, man.
Too bad it didn’t work out, but at least you’ve got no regrets about trying.
Thanks for the encouragement, everyone. We’re actually both at work right now, chatting over IM like we always do even though our desks are feet from eachother. She’s a little sad herself. After all, she’s got a ton of friends here and is going to have to leave them all behind, too. She asked me earlier if everything was OK between us, and I said it was. And it will be.
I deleted my online personal ad today… I’m not going to have much interest in dating for awhile. Though, really, I would be deleting it no matter what had happened last night. 
I just plan to spend the next month appreciating this wonderful friend I have before she moves away. It’s not like she’s weirded out at the idea of hanging out with me, so I think it’s going to be a lot of fun, though bittersweet, too.
At least I haven’t had many co-workers asking how my weekend was. Giving the perfunctory “oh, fine” is proving a little harder than normal today.
SNenc, just get her to come into this thread, and we’ll all tell her what a terrible mistake she’s making… 
If it’s any consolation, when I was a sophomore in college, I was deeply depressed after turning down my boyfriend of 2 year’s offer to move with him to South Carolina while he completed his residency. I beat myself up every day wondering if I had made the biggest mistake of my life. 3 months later I met my husband to be and the rest was history.
My personal opinion is that finding a spouse is like finding a house. You look and look and look and you think maybe this one, maybe that one. But at the end of the day, when you walk into “your” house, you know it right away. No thinking required. When you meet “the” one, it’s almost as if you’ve known that person your whole life. That’s how well the relationship fits.
SNenc, I hope that soon you’ll meet someone who will prove to you that this girlwasn’t really the one, but rather someone who was a nice diversion until the real one showed up.