Ah ok I get it. Though I had my shares of betrayals from best friends.
Once I was forced to move to a different school in my early teen years. I left all my friends without saying a proper goodbye, was pressured to do so by my mom etcetera. I felt truly bad about it but I was scared too, of the teachers getting to know etc. I did try to argue against it, but apparently a chance of better grades at a different school was enough for my mom. To abandon friends. Not for me. Because no matter what I could never get such a good and funny gang again. Some teachers hated me and gave me impossible to answer questions etc. And bad grades from that, so I guess grades were more important than friendship, not to me. But it was all against my will.
Now and then I still saw my friends but I kept my distance except the best friends that I had.
And well indeed I got the grades, but I didn't have friends there at the new school and I felt sooo depressed. And then after a while, the students/pupils just started to bully me, abusing my emotional weakness of missing my friends and all that.
My best friend eventually moved in to that school with me. But when things got tough and I got poisoned the next year and started to see a psychologist afterwards, and a shrink to get medication etc.
I used to be very passive back then and weak. I was the nerd to be target of every possible prank and more serious stuff later.
My best friend started changing his attitude, ignoring that some people stood around me and gave me hard time, though personally
he expressed a wish to throw a hand grenade into the changing rooms once.
And eventually after being absent for multiple months due to health complications and switching school because it was just too much to handle even if they turned most of the class on my side again....
then at that moment my best friend betrayed me to the crooks and the school gang. He blackmailed me with calling to a hospital that I was going to and telling them nonsense about me. My world was turning upside down and I couldn't stop the spiral. And then I fell in love with someone from the new school and then...no you don't need to hear all this heartbleeding stuff.