I have a cush on my bestfriend who is the same ...?

she is and said the only girl she would mess wit is her ex. we told each other we have crush on each other. i have never with a girl but i have nevr has such feelings like this for any other girl. she makes ual comments to me in which i like. i know she wants me but she doesnt make any moves. i have neva messed wit a gilr though. why isnt she tryin to make any moves? is it that she doesnt want to ruin our friendship cause we are bestfriends or is it that i neva messed wit a girl before?