Yes, what you describe could be considered a form of manipulation. Manipulation is when someone tries to control or influence another person's thoughts, emotions, or behaviors to serve their own interests or agendas.
In this case, your ex-narcissist may have lied about getting married to elicit a reaction from you. Manipulative individuals, especially those with narcissistic traits, often seek attention, validation, or a sense of power and control over others. By lying about such a significant event, he may have been trying to provoke an emotional response from you, possibly to see if you still have feelings for him, to maintain some form of control over you, or to simply create chaos and drama in your life.
It's important to recognize manipulation tactics like this and set boundaries to protect yourself from further emotional harm. Dealing with a manipulative person, especially one with narcissistic tendencies, can be challenging and emotionally draining. Surrounding yourself with supportive friends and seeking professional help, such as therapy, can be beneficial in understanding and coping with these situations.
Remember that you deserve healthy and respectful relationships, and it's essential to prioritize your well-being and emotional health. If you find yourself struggling to move on or feeling affected by this situation, seeking support from a mental health professional can be helpful in processing your emotions and experiences.