Originally Posted by
Pelmen 
I just could not trust her since she was spreading untrue rumours about me at school.
When we finally TALKED after three years she was sharp and said something like "f*** off, you are just a stranger to me and I have a boyfriend." Which is total bullshit since she is single.
I understand I made many mistakes and stuff but the question is :
WHY would anyone do this to me ? is she really THAT kind of a bitch ? was she just using me to feel better about herself ?
Hmmm, well, in my experience nothing ever happens in a vacuum. If she's nuts, she's pretty high-functioning. I can't imagine why someone completely disinterested in someone would bother to spread rumours about them.
I don't know what 'mistakes' you made, but the fact that she said that last to you is undeniable evidence she just isn't into you. She couldn't have been more clear if she'd slapped you. Sorry. Don't waste your effort thinking about the 'whys' of it anymore, its irrelevant. Just avoid her.