the universe always has and always will. infinity has no ends. we are all gods, creators of our realities, together we are one being, one soul
In everything that exists, we see entropy. In simple form, entropy is the fact that everything is running down and wearing out. In more complex form, everything is dissipating, diffusing, and spreading out. A way to say it simply is that all complexity is gradually becoming less complex.
On the universal scale, we see nothing else. We see nothing that shows us the reverse of entropy.
If the universe were eternal, entropy would have caused it to have virtually no complexity whatsoever by now. This means that the universe had to have had a beginning, and will probably have an end.