Well I can explain to you how the multiverse works but you may not fully comprehend the following
Lets say the Dot is YOU
Lets say 1 Dot further from the past dot is an alternate version of you
Each of the Dots represents you and it shows you a moving pattern to the right side which you could call the future.
Movement is created when energy passes through the multiverse.
So each movement is you passing through billions of times per second through frames of reality.
You could take a filmstrip and basically you will see that it has individual frames.
But once you run them through a projector you will see that it all moves smoothly in a moving pattern.
Reality works the same way.
So Time is the effect of moving through Infinite Parallel Universes all the time.
So if you were to say Multiverses don't exist than you basically are saying you cannot move and you would be standing still for infinity.
I will make a post about this in the near future but for now this is how i will explain it.