A good friend of mine's actions ruined my relationship with this other co-worker/friend/potential love interest of mine. What should I do now?

A couple weeks ago, I got a new job at an office through my good friend of 4 years'reference. They needed a good content writer, and I was the only person he trusted enough to do the job.

Around a week ago, our boss told us we needed a new social media exec, and if we knew someone, we should call them in for an interview. I knew this girl in college who asked me once if I find a new job opportunity for her, I should let her know. So I hit her up and the next day, she came, nailed the interview and was accepted.

Now the guy friend of mine already knew I liked this girl. The next day, which was a Wednesday, she came to work and our boss tasked her to sit with either one of us (either me or my friend) so that we can help her in creating a new Facebook page from scratch for one of our clients. I gave my friend a knowing look and he gave up his seat for her so that she could sit next to me and we can get started.

A few hours in and we were done. She was quite winded understandably, because this is her first day in a professional job environment and meeting deadlines. I gave her props on a job well done. Later when we were all sitting for lunch, and the girl brought up the topic of how she wasn't prepared how stressful office work can be, to which my friend (the guy) boasted that if she had sat with him instead, he would've finished it for her within minutes.

She asked him why didn't he, to which he responded to by saying "I would've, but my friend here (me) said he wanted to sit with you instead," to which, she made a weirded out "wtf" face and gave me a glance. I cut him off and called out for the waiter to come over and take our orders, but the damage was done. I shot my friend a glare. Later on, her behavior towards me changed and she not only changed her seats, but also, stopped talking to me altogether. Why did she do that, what did I do wrong, and what should I do now? Any suggestions, ladies?
Updates
4 mo
More than a year has passed since this, and I stopped talking to that girl and continued to mind my own business for the most part, talking only when necessary. She started gravitating towards my friend, who unlike me, wasn't as patient and understanding as I was with her, and he'd sometimes just yell at her to stop bothering him with stupid tasks. Almost month later, she left and I haven't heard from her since
A good friend of mine's actions ruined my relationship with this other co-worker/friend/potential love interest of mine. What should I do now?
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