Fun fact: It is estimated that from the Big Bang to the heat death of the universe, life is only possible for about 0.000000000000000000000000000000000000 0000000000000000000000000000000000001% of it
I've had to think a lot about the universe and the Multiverse.
How I see it is that we live in a universe. Each decision we make creates a new universe where that decision wasn't made(or a different decision was made). All of these universes exist in one giant multiverse.