I think diogenes has a great finishing there. And I don’t know if this is going off topic, but where I want to go from here is that their very well might be a multi-verse, but in this universe (inside the multi-verse) is where "we" exist. I have doubts that everything as we know it exists in another universe, and the only different is that I chose to wear a red shirt as I typed this. In other universes I would doubt “we” even exist.

A mans walking down a path and he comes to a fork init, he decides to go left. That’s it, he can wonder what might of been if he only went the other way, he might even turn around go back to the fork and take the right instead. No matter what choice this man made, at no point did he have the choice to go down both. Just cause he was making a choice doesn’t mean that at that instant a whole other universe was created for him, that in witch he could make the other choice. He had a choice, he made it and that’s how his life in his universe goes.

*Just an idea, another way to look at it maybe*