Heres where you really gonna have to make a choice and stick by it.
On the one hand u could stay friends and see her now and again, but it WILL obviously crush you should for instance she shows interest in another guy, im not saying this will happen but its an example. Also ur probably gonna like her more, and all the horrible emotions u feel now, its gonna get worse as ur feelings towards her get stronger. I could never be in a situtaion like this and i havent managed to despite my best intentions of being nice, becos it would drive me and it has DRIVEN me crazy, because i guess when I care so much much about a person, in this situation i would just analyse EVERYTHING and read hope whereever possible and it would drive me insane. I dont think a friendship can ever work out if one person in the friendship isnt satisfied.. cos ull just get angry, more confused, resentful and it will hurt more.
The other way is what seems to work out best, let it go. dont contact her, if she wants to meet up, meet up now and again, but dont read into anything and dont get too close, she should understand.. if not What does she want from you? Enjoy the time u spend but dont think about it before or after. If anything, check up on her now and again just to see if shes alrite.. cos obv u care.
You dont need me to tell u that eventually ur feelings will fade, sometimes far quicker than ud expect. Once they go i reckon that would be the perfect time to be real friends, happy with nothing more, hoping for nothing more. If u get close to her too soon, its gonna hurt. Obv u know, but im still gonna say it.
Also, dont think.. im gonna stay friends with her in case one day she'll change her mind. 99/100 they never do. If i were you, do whatever it takes to get ur mind clear of her. As ive said, once uve done that and it doesnt hurt anymore, there may be other options like friendship.. the most important thing is to stop feeling like u do now though.