People who want a second chance work at it every damn day. They never think they've done enough even years down the line. They don't expect those they've harmed in the past to ever be okay with them and they don't make excuses for what they did. They own it.
If I see those traits and behaviors happening then I know they actually want a life. If they ain't then I question what it is they're doing. You get a chance until you show you shouldn't.