In every fucking book about it. When they lose control over you, they will love bomb you and do everything they CAN to have that control back.
Cause from a narcissist point, all they want it's that control. And when you are out of it, they have that challenge to have it back.
They haven't changed, it's how they work. You need to love them, so they can resume their work. And for primate that only follow emotions.
It work 100% of the time.