Listen as a Pagan priestess this stuff is my job so no problem.
You see there's this goddess called Etsaanatlehi. Her eternal promise to humanity is that whenever the universe is on its final spark she'll blow it strong again. Note "whenever" not "when" so it happens a lot.
She's a pretty remote kind of sister but not hostile. Has nothing to do with everyday life. But I guess she is kindly because we don't even notice. It all goes on at the subatomic level.
So it DID end, and restarted. Might happen again quite soon. But Etsaanatlehi keeps her promise. Stops her getting bored.