I don't really see Akira behaving in a specific way that's of note towards Ayane versus how he treats everyone else in the beginning of the game tbh.
A lot of Akira's behavior towards other people follows a "I try to present mostly truth to people, evade the parts of it that would be damning, and thus put myself in a gray area".
If we're talking about being a dick to people, he's one to almost everyone and the people that are out of the curve (imo) are Rin (in that he treats her better than most people if good homie), and Chika (in that he treats her worse than most people by not rejecting their "relationship" and thus cheating on her).