Relationships

My friend ruined my chances with a girl. What can do I do now?

I met this girl through a mutual friend and we really hit it off. She had just transferred to my college and everything was going great. I asked her out and she said yes, but the triumph was short lived. I got the classic "we should just be friends" and "I just got out of a relationship talk." I didn't like it, but I didn't mind since she was new and probably trying to figure things out. We stayed friends and then things started to get weird. She started meeting some of my friends and hanging out with them, especially my roommate. I could tell she was taking time away from me, and again, I was cool. But my roommate saw it as an opportunity and slowly started to make his move. Seeing as he had a girlfriend at the time, she couldn't really see this happening and thought he was just being a friend. But I saw it and my other roommates saw it, and everyone came to the conclusion that he was stabbing me in the back. It got to the point where it was almost pathetic. He would literally tiptoe out of the apartment and close the door silently to go hang out with her. Fast forward to summer break and we all went back home. Now it just happens this girl and I are from the same town so we kept in touch. She started to tell me how clingy my roommate had become and that he was driving her nuts. And then the other day, he broke up with his girlfriend and told this girl that he was single. We all know that was for don't we? Now I knew for sure that my roommate was a mega douche for trying to go behind my back. I've even found out that he may have had a part in her telling me she just wants to be friends. He has made this complicated beyond belief and I don't know what to do. Can I even make a recovery? Because she was new, this girl has no idea the lengths that my roommate went to keep me out of the picture and how much of a jerk he was to me. Should I tell her what happened?
My friend ruined my chances with a girl. What can do I do now?
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