Well, to put to you gently, if there is more than a certain amount of mass in the universe, the expansion it is now experiencing will at some time stop and it will start to collapse. Time will even reverse at that point, but don't ask me how. Now is the time I have to explain about the expanding universe. After that initial bang, things continued to drift apart in an orderly fashion. The astronomical society has made it obligatory to mention, at this point, something about balloons.
Dimensions are wrong and stuff.
I won't bother you any more with that. I'll continue with the pending disaster. Well, we may just about have enough mass, but not quite. Then we will continue to expand infinitely, but to a finite size only. However, if there is really not enough mass, then we will continue to expand infinitely, to infinite scales.