this girl that i like

There’s this girl. That I like. I’ve liked her for a little while now, and I’m torn on what to do. Say something? Say nothing? I’ve perceived flirtatious signals, but in my experience, girls will flirt with boys they have no interest in. Reading girls is a fool’s game. You just have to throw yourself out there and hope you don’t end up shooting yourself in the foot. I’ve talked to my friends about the situation. One friend tells me, “It sounds like she likes you.” Another says, “She’s acting the way she is because she’s close to you and trusts you. It doesn’t mean she has feelings for you.” A lot is at stake; that is, a friendship that I don’t want to ruin. Rob once advised me, “Don’t wait too long to tell a girl you like her, or she’ll play the friendship card.” Gah. I am clueless. She is a wonderful girl. I’d like to date her and call her my girlfriend. I’d be very proud of the fact. But I don’t want to say something, end up realizing I’ve misinterpreted her signals, and then see the friendship flounder. Really good friends are hard to come by, and the idea of losing this friendship—not in the sense of it becoming absent but in the sense of it becoming less than what it is now—is frightening. Any advice would be great.