You approach too directly,try to find out what type of guy he likes,and if you are unfortunately not among her list try different approach.Since you are friends I believe you know pretty much of what she wants....why don't you try to slide up slowly,be funny and caring (as a friend,but if you stay in the friend zone too long..poof)always be there for her.Don't give up,explain you were sorry for rushing into things,and if luckily she forgive you????always remember that friendship can always tranforms into love..all you have to do is ..give it some time..when the time comes you will know