Damn, this sounds like a girl in real life that you had feelings for, right? (Most) Highschool girls only care about themselves. Yes, they WILL use you if you show signs of weakness. I believe the term for this is being 'platypus whipped.' Anyway, I'm not trying to be harsh if this is the case, but you just need to brush this off as a lesson to learn. If you want a girl to notice you, you have to act like you don't want her, but don't ignore her completely. It's got to be the right balance.
Basically what I'm saying is don't even bother with Highschool relationships at all. A lot of them never work out, and you'll be much happier.
Basically what I'm saying is don't even bother with Highschool relationships at all. A lot of them never work out, and you'll be much happier.