wanting her to shut up.

At that age it's really easy to confuse infatuation with love. It's understandable that she probably enjoys the attention she receives from guys, but maybe this is because she doesn't feel as great about herself? Just blow it off, when she starts talking about boys and you feel annoyed just brush the subject off by saying "Oh, you" and then change the topic to something that you'd both like to talk about. If that doesn't work maybe sit down with her and tell her that you like to hear about her life, but state that sometimes you'd appreciate it if she didn't talk about boys so much. Eventually your friend will quit this type of behavior, especially as she matures, and talking with her nicely and keeping her feelings in consideration could also help. I wish you the best of luck!

I totally agree with Erin. One thing I would add though is that after maybe you try changing the subject a lot and try sitting her down and explaining that you're not really interested in talking about boys all the time, it's okay to take a break from the friendship. No need to cut her out completely, but you can hangout with other people more often than her in hopes that maybe the two of you grow back together one day when you like to talk about the same things.