BWAHAHAHAH I think it is supposed to be like that since the first story focuses on their issues especially to the teacher nurse ML who is such a gaslighter at best(possesive, sarcastic,narcissist, sensual, selfish and etc.) and the MC who have experienced a mental and physical abuse (became a people pleaser and anxious) . The whole of the plot here is to show how broken they are and where it transitions to them healing each other. The other is possesive, the other is to selfless. Healing each other and both at the same time seeing the mishaps of themselves, they try to be someone that can be loved both to them.
I do not condone what the ML did, especially with the students and his bro-con attitude (he sucks btw). Other japanese mangas also has this stereotypical (or not) presentation of always the school nurses to be such a sensual person(bruh like they are so perverted and gross for that, it actually gave me the creeps)
I love the pacing of the story and showing the signs of improvement between them, this shows that people are not perfect and do not always improve immediately.
What bothers me about this story is that it started as a psychological manga and in the middle it changed to romance? Wtf?