You have been backstabbed, and you are livid.
Before you light up that effigy in the likeness of your backstabbing colleague [friend/acquaintance] or worse, run off to tell the boss [other], or worse yet, run off to gossip to someone else about what just happened, you analyze the situation leading up to this incident.
This is critical to understand, so I’ll repeat:
Analyze the situation. DO NOT analyze a backstabber’s psychology.
99% of the time, people who believe they are victims of backstabbing immediately go into backstabber psychological analysis. We try to figure out “why” a backstabber did what a backstabber did – and did to Us ! We may feel compelled to get into backstabbing psychology because we believed that if we understood how a backstabber’s mind worked, we could prevent a future backstabbing. We may also invest in deep psychological analysis because we (subconsciously) wish to shift blame from self (“Why did I let this happen to me? How can I not see this coming?”) to the backstabber, this required us to identify some faulty mechanics of a backstabber’s mind.
Unless we’re getting paid as the backstabber’s therapist (then we really have a problem), we are wasting our time and aggravating ourselves even more. The following paragraph explains most of the psychological stuff we need to know about backstabbing.