Hello everybody, in few weeks I'll be in a social gathering where I'll encounter ex-oneitis.. girl who rejected me.
First I want to give you a vague idea about what happened, me acting like a complete tool(which I realized after reading some PUA stuff) caused her to reject me, anyway we attended classes together for 7 months after rejection and basically...ignored each other, well once she asked me class-related question but that was about it.
How should I act when I see her? Should I say hi or keep ignoring her? Consider that I have no interest in her anymore, I'd just like to know which will make me a "better person".
Thanks.

Don't concentrate on her, but be social. Master the party. Befriend another cute girl and chat her up while your oneitis is near-by. Don't treat her as anything special. She's just another girl.

I understand that, but we have been ignoring each other for months(while seeing each other everyday)
Should I keep ignoring her or say hi?

I don't see a problem in saying hi. BUT it should definitely not be your focus. Relax, say hey how've you been and maybe another question, but cut it off then, say you're going to get a drink or something for someone and chat it up with someone else. Be sincere with it, and be generally interested but remember to leave. That will leave her looking for more

Yeah but after 7 months of ignoring each other, wouldn't "Hi, how are you" seem a bit weird?

It's only weird if you play it weird. Just be relaxed and cool about it.

Can you detail what you did to make you a tool - which made her dump you?

Thanks Pitts,
@Charles
She did not dump me, she rejected me.
She showed genuine interest for about a month or so, I didn't even like her, after she stopped showing interest I started to orbit her around, constant messaging on facebook, texts, following her around in University etc etc,
Then I mustered courage to ask her out(even though I was literally stuttering for first 10 minutes )
and as a result got this answer: "I'll pretend I didn't hear that, never tell me that again"
=( sad day that was. after that we've ignored each other for about 7 or 8 months despite seeing each other daily, we only spoke once(and she asked if I've seen someone, I gave a quick one-word response and that was it)

Well that doesn't sound too bad - apart from being a little needy. You probably missed your window though, right before becoming an orbiter.

As long as you didn't tell her you liked her or were in love with her, asking her out should have been fine... Provided you phrased it like "let's grab a couple beers" and not "let's go on a date".

It may have just freaked her out...

Ideally, you go to this social gathering with a girl who's hot as fuck. Way hotter than the other girl. You politely say hello to her, ask how she's been, then move on and be social.

just smile at her ... maybe say hi & a little small talk. No big deal If you don't make a big deal out of it it'll be just fine. use the opportunity to socialize with other women or other people in general... she'll see you having fun and that energy will either attract her or make her feel jealous.

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The "I like you part" was my last resort actually..
few days earlier I've asked her out on a date, she said she's busy when I asked her when will she be available she said "never"
I've learned my lesson though, never directly tell a girl about your feelings, nor get too attached to her, so what is this window you speak of?
thanks brandon I think that's the most civil thing to do,