Well... I was the jerk in this friendship. I gave her more attention in more ways than she wanted, not to mention using her to constant vent my every little frustration. She eventually got tired of it and started giving me the cold shoulder more often than not. The friendship falling apart had been building for a while.
I eventually got my [parasitic bomb] together and started (mostly) treating her right, but the damage was already done. She wanted nothing to do with me, and told me so the last time we had a serious discussion about our friendship. But she added, "If there's any chance you can change, then I'll stay friends." So we stayed friends. But like I said, too little, too late. She still treated me like a nothing.
I think I finally just got tired of being treated like that yesterday when her reaction to the nine-page story I wrote partially for her was "It was okay." Nobody [tornado fang]ing tells me something I worked so hard on is just "okay". Especially not their one of their characters is involved.
That wasn't the primary reason I finally called it off, but that was definitely the straw that broke the camel's back. It wasn't even a creepy story or anything. The characters acted and reacted naturally. I can't imagine she hated me so much that the very idea of her extremely neglected character together with my own would revolt her that much. But I guess it did. So, whatever...