"I've seen NO signs of him trying to get help or doing anything to start that process. The promise that he'll do something the next day never materialized."
This is all you need to know.
Words are easy.
Actions are hard.
Save yourself, yes? If it helps, you are giving him an example of what that looks like. Maybe he'll get it, maybe he won't, but you will have your life back.
Sending you a hug.