
leading her on then letting her down just because a guy came around is awful.. people say its alright since its just the most normal thing to do in this situation.. hurting someone and pretending that you did the right thing for the both of you is not alright and not normal.. have some decency and tell that person that you can not return her feelings the way she wanted.. let her decide if she wants to stick by your side or move on.. its always better to be hurt by the truth than be comforted by a lie.
it seem to me that Shiho noticed Aki's feelings for Yori before she actually did and got hurt... and now she's so determined to show Aki that she's a way better singer than Yori..