'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.
Because communicating like normal humans without misunderstandings is so difficult