She also understands she has to do something about Henri, be respectful enough to let him know that she's found someone else. So she arranges to meet him the next day, but she's not happy about having to do this.
https://i.imgur.com/AWxGedM.png
https://i.imgur.com/bxUdw9x.png
The way she ends up telling him is clumsy and way too harsh. Nobody likes being told that your loved one found someone "better", and Mira doesn't know how to be sensitive about it.
Henri gets extremely upset, and yells at her in front of the whole art square.
https://i.imgur.com/c1P10eg.png
https://i.imgur.com/snrT4Lu.png
Then he storms off. Well, at least she's done with it.