When I got herpes, I was depressed for quite a while. There's good news though: lots of people have it, and in my experience people are very understanding about it (I've never had someone turn on me -- or even back off from sex -- when I told them about it). Crazy as it sounds, having to talk about it before sex has actually brought sex partners closer, not pushed them away. People admire honesty. I'm sorry honesty wasn't extended toward you or that other girl.
Your life is not ruined, and I'm sure your future contains rewarding relationships. Keep in mind that there is someone (me) on the internet who identifies with you, cares about your situation, and wishes you a speedy recovery.