Getting rid of a bff that cant understand were nothing more than just friends

i feel like a need to vent but i dont like when people judge and i feel like i can tell you this because maybe you can relate

its been about 3 or 4 years that weve met and weve only hung out like twice but i feel that your non judgmental and will understand

so i go out alot and ive met tons of girls that want to hook up and just have sex as much as i love sex i feel an emptyness after getting with a girl for a one night stand but recently ive felt like i want more than just sex whether its just a best girl friend to hangout with watch movies and eat ice cream together with, walk to the beach, goto the movies together or a night of ice skating or hiking a trail.

im so tired of meeting girls that want to just use me for sex. Even my bff of 7 years has just recently started getting frisky with me but she basically is my little sister and as hottt as she is i cant do anything with her because i dont see her in a sexual way or anymore than just friends and she doesnt understand, i really dont know any other way to tell her but than just say " honestly your a really good friend and just because i dont want to have sex with you doesnt mean im not going to be your friend" she still doesnt get it, she calls and texts and constantly blows up my phone to the point where im seriously scared of talking to her its almost stalkerish stage 10 clinger!

Ive tried my best to set her up with my guy friends or even guys that i see eyeing her up and down but than she gets mad at me for trying to help her out. She tells me "why are you always trying to hook me up with other guys, i just want to hang and have fun with you." We have the most amazing time together only thing with in the past 7 years ive NEVER done anything sexual with her the furthers was slight grinding and dancing at the clubs.

She tells me that im so fun and she feels really comfortable around me and that i make her laugh and the she can pretty much tell me anything and that im such boy friends material... I than tell here of course you can do all those things and open up to me on a personal level that you cant with most people its because your like my best friend. Than she gets mad and say i dont want to me your best friend i really like you.... As for me i like her to and love her like a little sister but cant see anything past friends this has been so hard for both of us because i would hate to loose a friend of 7 years if she cant understand that were just friend and nothing more.