It’s part of their game. He had no intention of changing and it’s not your job to change him and pointing out things they did wrong as “new goof ups”. You weren’t best friends again. It was just temporary while they got some needs met.

Also, telling someone their life has no value and that they should commit to die” because of all the damage they did to others is in essence telling someone to kill themselves which is horrible. So based off of this one post I can see where they felt you threatened them.

They are apt at getting people sucked back in and it’s our job to get healthier and not allow it. We are attracted to what we are familiar with which could be why you think you run into narcissist all of the time. Yet not everyone is one. Everyone can have some narcissistic traits but again it’s not your job to save the world from them. You can make some better choices for yourself and not be around these types of people.