You have to make a move maybe she thinks your not interested as much. I have had a lot of guys that end up in that friend zone because they wait for me to make the move and sometimes girls will but in some cases they want you too or talk to her about it and tell her how you feel about her and she will tell you one way or another.
Alrighty darrius I have your solution. So there's nothing wrong with being friends with girls, but uniintentionally getting to that place is the worst. Realize that when you get to the friend zone its a lot harder to get out than it was to get in. So the key here is to eliminate "friend behavior." What I mean by that is don't do what her friends would do. Don't talk to this girl on the phone for hours everyday, don't do a million favors for her, and in general don't act like you really need her. don't get me wrong I'm not saying be a jerk but you have to understand that girls want a confident and challenging guy to date, and a soft sensitive puppy to befriend. DONT be the puppy. So next time you meet a girl, flirt a little bit or even make fun of her. As long as she sees that you won't do everything possible to please her than you'll be in good shape.
Workout. Pay her less attention. Start doing other things outside of your friendship, like talking to other girls, sports, etc.
Please don't tell her your undying love for her or anything like that. Think of this. What would 'James Bond' do. Would he put himself at the mercy of a woman to decide his fate? No. He would be direct, assertive, and express himself as wanting her for more than a friend. Rejection and fear comes with this territory, so just do it.
don't try to back out of the friend zone, go straight through, get close with her and try to break through it. if you can't break through it then just cherish the friendship and find someone else to try to date.