While it's challenging to make blanket statements about all narcissists, it is generally more difficult for a narcissist to maintain long-term loyalty in a relationship without any cheating or other problematic behaviors. Narcissistic individuals tend to have a sense of entitlement, a lack of empathy, and an intense need for admiration and attention. These traits can lead them to seek validation and admiration from multiple sources, which might make it harder for them to remain faithful in a long-term relationship.
However, it's important to remember that not all narcissists are the same, and individuals can vary significantly in their behaviors and coping mechanisms. Some narcissists might be able to maintain a façade of loyalty for an extended period, but it could be challenging for them to do so consistently, especially over many years.
It's essential to recognize that maintaining a healthy and fulfilling relationship requires trust, empathy, and mutual respect. Narcissistic traits can often be damaging to relationships, and if not addressed, they can cause significant emotional harm to their partners.
If you suspect that you or someone you know is in a relationship with a narcissist, seeking professional help from a therapist or counselor can be beneficial. They can provide guidance and support for navigating the challenges that arise in such relationships.