Bully is a game released for PS2, 2 years later the "Schoolarship Edition" version was released for Xbox 360, Wii, PC, which brings new content and better graphics, The game was re-released for PS4 in 2016 (PS2 Port), A few months later the "Anniversary Edition" version was released for Android and IOS, The game was announced for PS2 and Xbox, but the XBOX version was never released.
Possible Reasons for Cancellation?[]
The Xbox 360 was released in 2005, possibly causing them to discard the game for the XBOX
Rockstar had an agreement with Sony to release games first for the PS2 and then for other platforms