Yeah... If you're all excited to show your test scores to your older girlfriend and start making out for the first time with her, why would you bring a kouhai girl you've been making friends with recently along on the big date, unannounced, and then spend the entire time chatting with her while completely failing to notice how glum and lonely your girlfriend obviously is? Kouhai failed to exploit this rift between them and was rejected offscreen, and she was certainly making an effort to be that clingy, but I can't actually blame her for thinking she had a shot when the girl is this easily distracted. "Is this all she thinks of us, anymore?" Good question.