Best friend?

Hey Everyone!
Sorry I didn't post yesterday I was busy falling out with my best friend :(
Okay so here is the whole story:
My bezzie said to another one of my friends some really hurtfull stuff about me. She accused me of faking being ill because I went into town first day of our break. Well I got better on Friday still not completely over it so I didn't go school. I went to the doctors and they said I had a virus and rest would help. Then they said when I started feeling better to get out and have some fresh air. So I went out into town with my friends on Saturday, I was still getting over my illness at this point. So later on msn my bezzie talked to my friend and said "oh why was abbie out in town cus I thought she was ill. It's a bit funny how she is suddenly better when it's the holiday" I couldn't believe my best friend said this, like I was lying which I clearly wasn't because of what the doctor said. To make it worse she said to my friend not to say anything to me! But of course my friend did cus she is my real friend. So I started having ago at my Bezzie saying I cant believe how nasty she was. She just came back with more rubbish trying to turn it around on me when I hadn't even done anything! She was the one saying these things behind my back! She even wrote on her facebook: "Oh dear some people" !! I asked her whether she cared about us being friends or not, cus if she cared we could sort this out surely. She said she no at firt, she didnt care. I said thats exactly how your attitude has been through our whole friendship. I was always the one who made the effort and she never seemed that bothered. How can she be my best friend? So then she sed her cuz wrote that and I asked her again whether she was bothered about or friendship and I honestly thought she was going to say yes cus she is my best friend. But she said she didnt know whether she was bothered about our friendship. That really struck below the belt. How can a best friend have doubts about whether she cares if we are friends or not? I really dont know what is going to happen, but right now she isn't acting like a best friend. I guess I have found out who my true friends are. We will have to see what happens next...
So anyway I will probably write later today about my day so I will write again soon.
Keep smiling guys!
Abbie x