"Every thing which has a great start has an equally greater End" Is it true for the universe

As the title says that everything that has a beginning has an end 

AS i "thought" in the previous blog  The universe has a beginning,

so the main question that arises that is will it end?
 as many theories suggest it might end or it might not

theory 1->

This theory suggests that the universe has a gravitational center, and since the universe is expanding one day the lines of the universe will cross the gravitational pull and tear the space-time continuum apart and it will end in a catastrophe.

THeory2 -->

This theory also suggests that it has its own gravitational centre and

after trillions of years, it will also cross the boundaries of the gravitational pull and all of it will be pulled in like Ripchord in the centre to cause another big bang which we be the rebirth of the universe again

so after writing this I had a few more questions -

.) by the second theory has the bigbang happened more than once?

.) by the first theory what will happen if the space-time continuum will tear apart ?

so now Thats a lot of stuff , Think about it as i always say 

and keep asking the right questions