If Space if always expanding what is it expanding into? and will it ever stop expanding?

And what will happen if it does stop expanding?

And what is the place called that Space is expanding into?
Update: And will space ever come to the end of what it is expanding into???
Update 2: To Ben jamm

I also think this theory is most likely.....But answer this:

What made the big bang occurr in the first place? And the answer can not be it happens over and over again as what made this sequence begin?????
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