For someone who she supposedly loathes, Chiyo is certainly getting along with Ookuma like a house on fire, spending all her time with him instead of her "boyfriend." What happened to, "If possible, I’d rather not see him again…" You seem awful comfy, cozy and relaxed with Ookuma now, Chiyo, for someone who caused your "love trauma" and who you supposedly detest.
But I wonder, why couldn't Chiyo sleep? Was it because she couldn't stop thinking about Ookuma? And what was Chiyo actually doing in the middle of the night? Was she going to sneak into Ookuma's room for a midnight tryst? Was that why she was surprised to find him on the sofa?
Shall we take bets on whether or not she accepts his invitation? If what she says is actually true, that she wants nothing to do with him, then she's bound to refuse. But, on the other hand, if she really does have lingering feelings for Ookuma, she'll gladly stay, regardless of how her "boyfriend" might feel if he knew she was keeping Ookuma company in the middle of the night.