While it is not accurate to make a blanket statement that all narcissists will behave in the same way, blocking or cutting off contact after a discard is a common behavior among some narcissists. Narcissists often have a strong need for control and validation, and when they decide to end a relationship or discard someone, they may block the person as a means of exerting control and avoiding potential confrontation or accountability.
Blocking the person can also serve to reinforce the narcissist's sense of superiority and power, as it may leave the discarded individual feeling hurt, confused, and unable to reach out or seek closure.
However, it's important to remember that individuals vary in their behaviors, and not all people with narcissistic tendencies will follow this pattern. Some may keep lines of communication open for various reasons, such as maintaining a potential source of supply, seeking validation, or trying to keep the individual on the back burner in case they want to return to the relationship later.
If you have experienced a situation like this and are struggling to cope with the aftermath of a relationship with a narcissist, it can be helpful to seek support from friends, family, or a mental health professional who can assist you in processing your emotions and developing healthy coping strategies.