I can offer some general insights into why someone with narcissistic tendencies might behave in such a manner.
Manipulation and Control: Narcissists often seek to manipulate and control others to maintain their sense of power and superiority. By telling the new supply about plans that were once shared with you, the narcissist may be trying to provoke jealousy, insecurity, or doubt in your mind and create a sense of competition between you and the new person. This tactic allows them to feel more in control of both relationships.
Seeking Validation: Narcissists thrive on attention and validation. By sharing plans with the new supply that were once between you and the narcissist, they may be seeking validation and admiration from the new person. It reinforces their self-perception of being desirable and appealing to others.
Idealization Phase: In the beginning stages of a new relationship, narcissists often engage in an "idealization" phase, where they put forth their best version and present themselves as the perfect partner. By discussing exciting plans like moving abroad together, they aim to win over the new supply, making them feel special and creating a sense of a bright future.
Devaluation of the Previous Relationship: Narcissists may devalue their past partners once they have moved on to a new relationship. By suggesting to the new supply that they have better plans together, the narcissist may be attempting to diminish the significance of your past relationship and portray it as less important compared to their new connection.
Remember, dealing with a narcissistic individual can be challenging, and their behavior may not always make sense or follow conventional logic. It's crucial to prioritize your well-being, focus on your healing, and seek support from friends, family, or a therapist to navigate the aftermath of a relationship with a narcissist. If you find yourself in a situation that causes you distress, consider seeking professional help for guidance and support.