Firstly, I'm in high school.
Well I've liked the same girl for a while now. I used to be the nice guy but since reading the game changed my attitude completely. She began to like me as more than a friend (her mate told me) so I told her I liked her.
She then said to meet up round hers, however the next day told me she wanted to be friends. I got really offish with her, and ignored most of her texts and her in person. We've since starting speaking more, and she keeps ringing me up when she's drunk. She text me asking why she hadn't 'done anything' with me because I'm really nice once when she was drunk. Also she told me yesterday
she used to like me, as she thought I didn't know.
Do I still have a chance?
Any advice well appreciated.

Yeah, well. Hate to break it to you, but that's the important part.
'Used to'. Past tense.