Betrayalism 

Study of betrayal also often refered to as snakes

The people who backstab you are considered under betrayalism

Betrayalism by Macbeth November 27, 2017

top 10 anime betrayals 

A phrase that is uttered whenever someone is betrayed by another, usually in a lighthearted way.

Nick: Hey what's up, you gonna drink that soda?
Dick: No, you can have it.

*Nick reaches for soda*
Dick: NOPE (chugs drink)
*Nick staggers back and faints*
Rick: Top 10 anime betrayals lmfao

top 10 anime betrayals by A talking pepperoni appears December 13, 2018

Two Betrayals 

Simply one of the best forums ever, made by forum master Aphotic. All round convo, but focusing mainly on HALO!!
2betrayals.proboards23.com

Too tight for examples.

Two Betrayals by BringMeCloser April 20, 2005