Because communicating like normal humans without misunderstandings is so difficult
'Cause they're teenagers, I don't know how it was for you, but it was like that in my school xD Everyone was too prideful or shy to talk about their feelings or clear misunderstandings, I even had a friend who didn't talk to me for a whole year because she thought I didn't wanted to be her friend anymore, 1 year later I asked her why she stopped talking to me, and she was like "but I thought that's what you wanted, because you had some new friends...", I was like " Σ(  ̄□ ̄||) Nooo, they are new friends but you are also my friend", so let's say a "HOORAY!" for communication, lol...
So embarrassing, but it was like that in my school (from junior high school to high school), all the time.
I just hope the writer knows what they’re doing