Yes, it is common for narcissists to engage in a tactic known as "triangulation," where they try to create a dynamic where the old supply (previous partner) is portrayed negatively to the new supply (current partner). The narcissist does this to assert control, create division, and prevent the new supply from forming any connections with the old supply.
By portraying the old supply as a bad person, the narcissist aims to manipulate the new supply's perception, instilling doubt and distrust about the old supply's character. This can make the new supply more likely to distance themselves from the old supply and avoid reaching out to them in the future.
The narcissist's goal is to maintain their sense of power and control over both the old and new supplies. By preventing any communication or reconciliation between the two, they can ensure that they remain the central figure in both individuals' lives and maintain a sense of importance and validation.
It's essential to recognize that this tactic is a form of emotional manipulation and can be harmful to all parties involved. If you find yourself in a situation where a narcissist is trying to create division and manipulate your perception of others, it's essential to be aware of these tactics and seek support from trusted friends, family, or a mental health professional to navigate the complexities of such relationships. Building healthy boundaries and focusing on your well-being can help you break free from the toxic influence of a narcissistic individual.