My question is how old are you? Further, find yourself with someone else. If she does have feeling for you they might come out while your dating someone else. Also, is it her that you want, or is it the idea of dating your best friend?
Over my years of dating I find that it's best to meet a girl to date and then her becomming your best friend. That is why people say they love to date their best friend. It becomes much harder makeing a friendship into a stable relationship. It can be done but it is difficult cause many find it just wrong being intimate with a friend, kissing and such. You might want to fully deside for yourself. Here is a good quote and analogy for you.
Everything that is built with great wonders take's much time and wait. It can never be rushed. If you rush you will lose the very thing you strived for. Whether it is when the football is thrown or to build a pyramid. You rush and you will lose. All things are built in time to fit where they belong.