What do you think of this possibility?
The Big Bang is the first event in a chain reaction of causality, that lead to you being here today. If you ask how you are here, because your parents gave birth, because their parents gave birth, then look deeper - your ancestors are here because of the animals they evolved from, they are here because of the earth. The earth is here because of the universe, the universe is here because of a Big Bang.
Now ignore that you have free will, and everything you do is a chemical reaction in your brain that is responding to the events happening around you, every event leads back to the big bang. Therefore the inital state of the big bang defines every event after it, including your thoughts etc.
Now imagine that there was a "Big Crunch" followed by a second big bang. If this big bang happened in the exact same way as this big bang, then every event after it would happen in the same way and you would live your life again...
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