Brooke

Brooke is a girl that Austin dated in the episode Magazines & Made-Up Stuff. However, she then believed that Austin was dumping her for more fun stuff, and THEN found out that he was cheating on her (which he wasn't really), so she broke up with him. She is the first girl to go out with Austin, since Cassidy agreed but never could, Kira was introduced later, and all of the other girls are too minor to mention. She is also supposed to appear in the upcoming episode Tunes & Trials, where she starts hanging out with Austin again, causing Trish and Dez to believe that Austin wrote a love song (Steal Your Heart) about her. Kira and the girl who Brooke thought Austin was cheating on her with are also possibilities, alongside Ally. In the end it's revealed to be about Ally, but it's probable that Brooke and Austin are still friends.