My mind boggles too.
What time was it before time began? What did the Big Bang singularity expand into, if there isn’t anything beyond our universe? If things that fall into a black hole can’t come back into our universe when the black hole evaporates, where do they go?
If everything that ever existed, time, space, information, and all, is destroyed with every Big Bang cycle, there’s no point to either the universe or us existing at all.
I just can’t believe that.