How do I stop being friends with this person?

[awesome person]

Well this person and I have known each other going on 3 years...
She's changed a lot, she doesn't care about things unless it's her way, like she called me one day to ask if I was going to her birthday party and I said no I couldn't because I was very sick and had a lot of AP homework, where she suddenly got an attitude and said "so?" and I was like "whatever" and then she just hung up on me. I thought friends were supposed to be caring? If one of my friends was sick I'd at least tell them that I hope they feel better soon and try to make them happy or something.
Also, this girl does not take anything serious. If you tell her something, she will blurt it out in front of everyone, and she's done this soooo many times at school. I've told her many things in my past that are bad, and she will act like she doesn't care.
I don't know. I don't want to keep being her friend anymore. How do I go about this? It will be hard because she's on my profile a lot on facebook and we have over 105 friends in common, so if I block or unfriend her she will find out. She's also one of those people who will text or call you many times just to make you mad. She also knows my parents facebook and also has my ex as one of her friends on facebook and I'm scared she will send stupid stuff to them or tell them things I've said or done.... Help?

[Ariana]

i have a friend like her....i hate her freakin guts

[Ben]

Talk to her nicely and tell her what she is doing wrong and let her know how it made you feel.

[Platnium]

Ignore her

[Juliana]

just ignore her till death

[Renavine]

Distance! Get away from her - you don't need a friend like this. Unsubscribe from her on facebook and you will stop reading about her. Tell your parents she is becoming a jerk so they know in case she pulls anything. In the future, don;t tell so many private details to people. Reply to her texts but not all and take a while to return. She will tire of you. Also can you get into anything new - new hobby, club, sport, so that you could claim you have a new interest and thus less time for your friendship.

[yessenia]

start to distant yourself slowly from this person. You don't want to make anything to rash. Just start hanging out in different places a day here and there then she does. Don't call or text her or message her on Facebook. She will actually start to distant herself from you on her own because you suddenly wont be any fun to be around because your never around. Then change your number, get a new account. Well that'ss how I distanced myself from a lot of people back in high school who I did not want to be around. Good luck I hope this helped a bit.

[Adel]

You make it simple. Walk away from her. If she follows simply say you want out of the relationship. You do not owe a pile of explanations. A simplle statement is best. I like you as a friend.. I want to remain friends with you. However we are so very different, you are much more outgoing than I am. I want more privacy so perhaps I will be looking for another place to stay. An put a plan to get away for a while. I do not like people blurting out my business. Those people have to learn boundaries.
You must learn to defend your boundaries. I must learn what I am telling you to do! Good to both of us