isn´t it little bit selfish don´t chase him when he run away because she want to protect herself? And when Yuma said "For me.. and probably also Maguro-san the thing that would make me worried the most if you were worrying all by yourself." it is not truth. If she would worried most about this, she would chase him. She let him think the worst.
For me it is step back from character development. If I am looking on specially last few chapters and how she acts, this is step back. She seems to be emotionless until last two pages.