It's important to remember that I don't have access to specific details about your situation, but I can offer some general insights into possible reasons behind such behavior.
Narcissists often engage in manipulative tactics to control and dominate others. Making someone feel like they are cheating when they are not can serve several purposes for a narcissist:
Emotional manipulation and control: By making you feel insecure and jealous, the narcissist gains control over your emotions and actions. They may use this as a way to keep you constantly on edge and more dependent on them for reassurance and validation.
Boosting their ego: Narcissists thrive on attention and admiration. By making you jealous or anxious about potential infidelity, they may feel a sense of power and importance when they see the impact their actions have on you.
Creating a diversion: Accusing you of not trusting them and focusing on their alleged infidelity can deflect attention away from their own questionable behavior or actions in the relationship. It shifts the focus onto you, making it easier for them to avoid accountability.
Testing your loyalty and commitment: Narcissists may use such tactics as a way to gauge your devotion to them. They may want to see how much you are willing to endure or put up with to prove your loyalty, giving them a sense of superiority.
Triangulation: This tactic involves introducing a third party into the relationship dynamics. By making you believe they are cheating, the narcissist may intentionally create a sense of competition or rivalry, which can make you work harder to win their affection and validation.
Fueling drama and conflict: Narcissists may enjoy stirring up drama and conflict as it keeps the focus on them and creates a chaotic environment. They may feel a sense of excitement and superiority when they see how their actions impact you emotionally.
Remember, the behavior of a narcissist is driven by their own deep-seated insecurities and the need for validation and control. They may use various tactics to maintain their self-image and manipulate others to serve their interests. If you suspect that you are dealing with a narcissistic individual, it's essential to set healthy boundaries and consider seeking support from a therapist or counselor who can help you navigate the situation and protect your well-being.