People should have gotten it by now what is happening with Jiu-ji-Tae, he has fallen in the same pit of pure despair Maria was in when she first rolled in the academy, he is as edgy as she was before she suffered a huge loss against Class 3.
Maria was forced to bottle up her issues, instead of actually recovering from them. Jiu-ji-Tae's character arc is how to overcome the same issues without bottling them, to also save Maria on the way.