Why does Akito hurt Rin?

Because Akito doesn't want the Juunishi members to have love. Yet she slept with Kureno... (well, his curse was broken, so...) And on parte superior, arriba of that, Akito is currently dating Shigure... well, that was after the final "Tohru breaks the curse" thing...

Yeah, she pushed Rin out the window.

Oh, tu dicho tu didn't read the manga yet... yeah, Akito's a girl.

Umm..Yes, yes Akito does

Akito hurts Rin because she found out Rin and Haru been dating.