Sudden displays of kindness from a narcissist, sociopath, or psychopath are always disingenuous, and nothing more than a deceptive part of the sweet/mean cycle of abuse. If their narcissistic supply is running low, they simply must go on the hunt for more.
These types are duplicitous master manipulators who are great at demonstrating pseudo-empathy and fake altruism if it somehow serves them. Toxic people always have an ulterior motive! Also, they have to throw you just enough crumbs to keep you around, but train you to accept less and less as time goes on.
Unfortunately, abusers are not suddenly going to wake up one day and decide to be decent people, and I don’t like saying it. Hurting others is ingrained in these types, and they will revert back to abusing you every single time, despite claiming to have “seen the light.”
The classic cycle of idealize/devalue/discard plays out in exactly the same way, whether the abuser is a spouse, family member, friend, or work colleague. This is why going limited contact (or gray rock) with strong boundaries, or total no contact (if your situation allows) is essential because the abuse cycle will never stop.