Why are some people so spiteful?

There's this girl I know online, and probably close to several years ago, we were in to a particular fandom (game series/whatever) and to this day we still are, but there's a problem:

---A while back we had a fight/disagreement/rant whatever you want to call it.
---The things we disagreed over were ethically debateable/controversial (not something you could easily talk about, some stuff I was biased against but have since been trying to be more understanding about, even though I'm very 'conservative/old-fashioned' in my opinions on things).

---Since then she has made it her life's crusade to wreck my reputation, expose my personal life, humiliate, insult, and do everything terrible imaginable to me using chatrooms, Twitter, Tumblr, and other media at her disposal.

---I have tried many times to bury the hatchet, but to no avail (even complimenting her achievements within the fandom we are in), but now I can't speak to her for five seconds without vitriol and garbage coming out of her towards me (I hardly say anything to her anymore).

---I once asked her why she was doing such things to publicly shame me, as it was borderline hate-stalking by my estimation, and she justified herself by saying that "so long as she was doing it in public, it's not hate stalking"... I'm really not sure if that's true.

Now, I have friends and my own social circle/clique of people and to this day they still wonder why she holds such a deep-seated grudge against me. I'm at a loss as to what to do.

I've already explained my side of things (and even admitted my own mistakes) to them, and they understand me clearly. I'm not so conceited as to think it's not my fault (and it's not entirely my fault)... but at the same time something's got to give.

But what I don't understand is, why? Why go this far?

She hardly understands who I really am, but all she can think about me is hatred and malice.

I don't know what to do, short of reporting her.

Report her or ban her or whatever from your pages or whatever on social networks. If she posts something about you just ignore it and move on. If you keep letting it get to you them she will just keep doing it, "stop feeding the beast." If she tries something in a public setting in the real world call the cops or get a restraining order on her, if it goes that far. So don't even talk to her or anything and just cut your ties with her.

To me she sounds crazy and really must have done something big to set her off.

Sounds crazy and a bit petty. It's one thing to be heated in the moment, but to carry a torch for 7 years is too much for any person. Just report her and ignore the rest. Life lesson is not all people are happy in life. Some people are miserable and take their hardships out on others. Anyways, as Blink said whatever you did to set this off I would recommend not to do it again. Also be careful about who you debate and such; usually waste of time for the most part when people don't give a shit and when you risk the chance if shit hitting the fan.

'so long as she was doing it in public, it's not hate stalking'

for the sake of justice, pimp slap that ho

What you got there is one petty bitch and a lost cause.

I'm being serious; cut off contact and report her on everything she's harrassing you on..

I don't know what you said to make her forever hate you, but at least you've tried multiple times to build bridges, and each time ended up back at square one. 7 years is a bit too long to hold a grudge over minor personal disagreements.



So just because she thinks it isn't hate stalking, that it isn't and this kind of behaviour is totally okay.

She needs to see a psychiatrist, or any help at all. She obviously has some issues.