I am really into this one girl I know, even though I dont show it around her. Now a lot of people on these forums say that oneitis is not good thing to go through and is a common AFC trait.
The thing is I find being around this girl like a drug I hope of most nights I go out that I will run into her, where we usually flirt a little, and the nights i go out and dont see her I feel like they were bad nights.
They say in life to do whatever makes you happy and I am happy when I am around her and even after the fact of being around her. We once made out a bit at a club and I felt on top of the world after, but when I hook up with other girls I dont feel the same gratification. However despite this the girl has caused alot of tension and anxiety for me she has confused me many times for being really hot and cold around me. She has given many signs she is into me, and has also completely ignored me in some places.
Now you might say "This is pathetic just forget about her and move on as hard as it may be" but the thing is I dont really want to. There is a lot of stress going on in my life right now with major family issues occurring, and I feel this is the only thing that I look forward to.

Anyways this is a kind of lame story but I was just wondering if I SHOULD just completely forget about her, and how should I? Because it is hard since we go to the same college and are constantly running into each other at parties and bars and such?

first you have to determine if its oneitis.

oneitis is specifically when its onesided. like you love her and she ignores you or at least never plays into liking you.

your post was TL;DR and from what i saw there is still a chance, but you do need to reframe things so she's not the only thing out there like you seem to feel, since you'll just make mistakes to make this real oneitis.

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Every Saint has a Past, Every Sinner has a Future

Nice name Diablo...

Anyway, why did you only "make out a bit"??? Get back to where you were with her at THAT moment at the club.

And while not around her, try hitting on other girls. Its always nice to have a backup plan in case one day she tells you its definitely not going to happen.

Also, you say you're really happy around her but that she's hot and cold with you and has caused tension and anxiety. Why would that make you happy? That would piss me off. F*ck that man, plus she sometimes IGNORES you. What does it say to her that you allow yourself to be treated like that? Do you think she wants the man that allows people to disrespect him. Tell her you don't like that sh*t and not to treat you one way on one day and another way the next day.