Virgo guy and Virgo girl- what went wrong?

I've never actually met another Virgo guy and usually I had always been told that earth signs were what was best for me. SO I met a guy and I treated it completely as a fling. We were introduced througha mutual friend and we had a good time but I didn't even think twice about it going past that weekend. He then proceeds to add me on Facebook, hit me up all the time and ask his friend about me. SO I gave him my number. We then, proceeded to talk everyday- he lived in Vegas, and I was back on the east coast. Still though, I kept to myself, I didn't really pursue anything because we all know long distance relationships don't work.

So this goes on for a month. He then invited me to come see him in Vegas- school had just let out and I wanted a vacation anyway. So I planned on going balls out and having a cross country fling and coming home. The sex was, afterall spectacular. So I get there, he treats me as a girlfriend, not hookup buddy- he even goes so far as to actually make me his girlfriend. I agreed but only after making completely sure (or so I thought) that a relationship was what he wanted. He even asked me to move to the west coast to be closer to him so he could see me. He even went so far as to tell his friends and family about me and asked em to do the same; he updated his status on FB (making what we were doing public).

So one would think I had hit the jackpot- same sign, he was older, he was private and shy like I was abd I felt great about him. He really made me happy and had me convinced that it was ok to come out of the protective shell I had encased myself in after being hurt so many other times inthe past and feeling like a relationship failure.

So after I get back from Vegas, things are moving aong fine and a week later, he tells me that he can't do this, he doesn't see how it will work, he would rather hurt me now than to hurt me later, etc. ANd then drops off the face of the planet.

So I guess my question is wtf? How did we get along so well up until that point only for him to COMPLETELY 180 out of the blue and then just leave me hanging out to dry and embarass me like that? What was the point of entering into a relationship at all? I don't get it...