Let me down easy

Based on completely true events that I actually witnessed and based on several people I interviewed to make sure of my facts.

Young Love...
It makes so much yet so little sense...
In High School, everything seems serious and everything is a complete drama.
The current drama status: Peter is dating Kimberly.
And the two seem to a sweet couple, the music nerd and a popular girl.
But Anna, One of Peter's long life friend, hears that Kimberly may break up with him, and make a huge event of it.
Anna loves him herself, they've been friends since forever, and she doesn't want to see him get hurt or humiliated.
But what should she do?
Does she tell him?
Does she let him find out for himself?
Does she confront Kimberly? Peter? Anybody?
And when Peter finds out... What does he do?