Maybe i missed it, but why would she do that? She was just encouraging Koharu to keep it a secret...
The type of jealous person who'd rather your idol get taken down a notch than have an S/O?
Or the fact that she asked to meet with Akane right before... stepping-stone for streaming? I suppose jts more likely to be jealousy, seeing her in past chapters...
But I don't feel a bit sad about her tears lol. If its either of these things she tacky af. She has some legit concerns for Koharu, but kinda hypocritical or her seeing as she followed Koharu to the shop as well...