Wow, Nico's a jerk. She'd better dial that emotional manipulation and "scolding" back a bit, or she'll lose Maki and only have herself to blame.
Agreed! All the other couples are quick to forgive each other, so Nico's attitude was jarringly negative and self centered by comparison. (I'm worried about the shift towards tsun in recent tsunderes, I feel like they're getting harder and harder to forgive. Or I'm becoming less patient. Or both.)
I feel like you guys are being a little to harsh on Nico. This is just her personality, and always has been. She is a pretty selfish individual. But, in this comic I think she's mostly hurt because she thinks that Maki's job is more important than spending time with her. Since Maki is a doctor I can imagine she works weird hours, and maybe they don't spend to much time together. That would make the rare time they could be together that much more special.