My girlfriend is being stalked by a narcissist he won't stop bothering her and I have even told him too stop but he won't stop what should i do?

It’s important to prioritize your girlfriend's safety and well-being. Encourage her to document any interactions with the stalker and consider reporting his behavior to the authorities, as stalking is illegal. Additionally, she might want to consider seeking a restraining order if the situation escalates. Support her emotionally and help her find resources, such as counseling or support groups for victims of stalking.