What if you can't die?

What if every time you are about to die, reality diverges and you end up in a timeline where you survive? Every time you have a close call you actually end up dying from the point of view of everyone else, but from your POV you're like "dang that was close".

I lost my friend in an accident about 2 years ago and this is fascinating to think about. What if he's only dead in my timeline, but he's like "dang that was close" from his POV?

Can you guys recommend any literature, movies, documentaries, podcasts, etc, that explore this idea or other similar concepts?