Sooooooo...remember when I said that your life wasn't going to really change at all, John? There were no fireworks, no parades, your life doesn't just automatically get better just because you lose your virginity. Was I right, at least in your case? If anything it gets harder because from the sound of it, you're really attached to this girl and it sounds like you're sad...I've been there. So basically, you just traded one problem for another...sex sometimes complicates things. It really doesn't seem like such a big deal in hindsight, does it? Now you've got this loneliness to deal with, which is really, really difficult after you've been intimate with someone and they leave...it's the story of my life as well. You'll be ok though, trust me. Just keep your head up and stay busy. Right now your head is probably swimming and you can't go a single second without thinking about her and you're wondering how you'll get over this feeling. Don't worry; it will pass.
Welcome back, anyway.