Blame shifting is a common deflection tactic narcissists use to avoid accountability for any wrongdoing on their part. Nothing is ever their fault.
Narcissists love to play The Blame Game. In their warped minds, their inflated ego and sense of superiority depend on their infallibility and an image of perfection, thus admitting mistakes, failures, or shortcomings is unacceptable. By shifting blame onto others, they sidestep any feelings of vulnerability, shame, or imperfection.
Blame shifting is a tactic narcissists use to project their insecurities onto others. Anything that goes wrong is never their fault. If you're expecting a sincere apology or admission of bad behavior from a narcissist, good luck. What you'll likely get is something like this: "If you hadn't done 'x', I wouldn't have had to do 'y'." In other words, "You made me do it." They've now unloaded their shit onto you, and you're left wondering, WTF just happened? Is it me? Am I the problem? Am I imagining things?
In a nutshell, dealing with a narcissist is a crazy-making shitshow. And, no, their toxic behavior is not your fault! You must learn to sidestep their blame—and their shit.