To my understanding of what you are saying, it sounds intended actually, let me explain.
The game have 2 paths/routes:
- Good girl(study) - Teacher path
- Bad girl(don't study) - Slut/whore path
As soon as you hit the required mark for one of these routes, you get locked in that and cannot change back after a certain point.
In this case you have taken the good girl route, where the MC falls in love with the teacher, and even if it have some interesting scenes, its also the shorter router of the two.(my guess is you have pressed
study more somewhere, either in class, library or at home).
So go back, and try the other route to get the full experience - if you want? (press
don't study everywhere you see the option)
PS. the routes really don't have these names, its just my definition of them.