They usually say you move on to the next when you're bored with what you have. Although, I usually seem to be bored well before - S1.E19

Rina informs Yuki directly that her and Touya just kissed after showing up at her dressing room. To muddy the waters further, Touya joins Rina at M&MM as her assistant. After this devastating blow, Yuki tries to distract herself from the pain by biting her wrist as she hears Rina's painful words. The next week, as Rina and Touya begin their job at M&MM, Itsuki orders the two of them to sit in on Menou's recording session. At the studio, Touya makes the connection that Menou is the girl he met outside the Yunagi Koukaidou on the night of the Christmas Eve concert. Menou seems to care less about her actual album and lets Rina handle the recording while she chats with Touya...