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It was painful to watch Shuto and Mirea interacting with smiles and laughter. Rio knew it was her fault for never speaking up about her feelings. Now he belongs to someone else, whom he would risk everything for.
Part of her was jealous and bitter, but a different part was happy. There was a time when Shuto didn't smile and almost anti-hero, which she now knows was because of Ratman. It's a relief to see him laughing with the other girl. Rio knew exactly what she needed to do.
Go home, have a good cry where no one can see her, pick up the pieces of her broke heart, then move on. Shuto deserves happiness, and she will not be the reason why he loses it.