The narcissist can’t be alone. It’s not possible as they would absolutely collapse. They always have someone lined up. Always. And you’ll see this because they suddenly no longer mirror you and their physical appearance and interests change overnight.
Suddenly the usual disdain and contempt is ramped up to the point you begin to fear for your life. Then they jump ship and the discard is complete. Don’t be sad. This is the best gift a narcissist can or will ever give you. Your freedom.