I know this is just going to provoke a "strongest" joke, but Cirno's reactions here seem a lot more mild compared to most of the others in this pool. I mean, she's sad and it's heart-breaking as it's supposed to be, but she's taking it all pretty well.
Practice hurt expressions of your wifeWhen her lover badmouths her.When her lover slaps her.When her lover breaks up with her.When her lover is avoiding her eyes.When her lover expresses fierce dislike towards her.When her lover is talking to someone else.