Three of the Fixed Signs, Taurus, Leo and Scorpio in particular are sensitive to treachery and betrayal. This is due to the moment becoming crystallized in their minds, baggage that they must carry, where that person or group is a walking remnant of the times they felt so much pain. Each of these signs forms heavy attachments to the ones they care for, making the betrayal that much worse. They do however, experience the aftereffect in slightly different ways.
Taurus will think of karma, believe that what goes around comes around and will likely not actively seek revenge, yet may think of it. They will internalize their pain, carrying it with them as an unwilling accomplice for the rest of their days.
Leo will react with extroverted hurt and pain, making it clear to those around them the damage they have suffered. They will likely not seek revenge as such, for they are actually rather gentle people, but will relive their betrayal as if it was a tragic performance on stage.
Scorpio may more actively seek vengeance, where they believe that what goes around comes around, yet usually from themselves. The thing is, after their revenge has been fulfilled, they will likely not feel much better for it, a dark mark on their soul, because nothing can undo the hurt that they felt.