.

Read 3-4 chapters back. She used her brother so he could try the uniform that the prince got made for her. Her brother then ran into the prince and freaked out. The way her brother looked at him, reminded the prince of the way everyone who fears and despises him because he’s half demon, does. Her brother and Letio made up an excuse about why they had to leave (it was really so the twins could switch). Then the prince saw her speaking with Letio outside and thought she lied about having to leave so she and Letio could meet secretly.

Since he’s so very sensitive, the prince views lying as a betrayal of his trust. She feels bad about it because she knows she’s lying about something more.

Ahhhh ok, i forgot about their excuse to leave
Thanks~^^