Love unites and brings together as one.
That's a common theme in religious mythology. There's certainly a widespread cross-cultural (but certainly not universal either) image of the divine as Oneness, as primordial unity of some kind. That's often thought of as something very desirable indeed, as literally the best thing.
But the formation of the universe initially differentiated, separated and divided the universe from a singularity; boom, let there be light.
The religious traditions commonly imagine the differentiation and fragmentation of being away from Unity to multiplicity as a fall of some kind. All the little pieces, which include human beings like ourselves, are isolated and estranged and cut off from each other and from the All. We see ideas like this in Kabbala, in gnosticism, in Neoplatonism, in India, and all over. So one's religious path and the goal of salvation would seem to be obvious, to return to and perhaps to finally merge with the Unity, with God.
Kabbala is especially interesting in this regard, since some Kabbalists took this imagery very literally. They imagined that God literally broke himself into pieces at creation, he flew apart into phenomenal reality, and that the mystical role of the Jews is to literally put God back together again.
That neatly accounts for the problem of evil and for the hiddenness of God. (God is literally gone.) But I suspect that most conventional monotheists will be repelled by the idea.
Maybe an act of love freed the universe, so it could separate and then return via love.
Yeah, it's possible to imagine that as long as all of reality exists as one undifferentiated unity, it would be impossible for individual consciousness like our own and for interpersonal relationships to exist. So to make us possible, God had to separate us from himself.
If we push that idea harder, we can say that in order for diversity to exist, unity had to go away, meaning that God had to more or less commit suicide so that we can be. It's even possible to imagine that event as some kind of Christ-like divine self-sacrifice in which God died to release us.
And it's possible to imagine the task of all of the universe's finite intelligences to be the mirror image of that, to reascend, to put God back together again, which would necessarily involve their own self-sacrifice as they give up their individual existence so as to merge everyone and everything into One.
Then the reconstituted One can once again sacrifice himself for us, so that individuals might once again exist, in what might be a never-ending cycle of cosmic expansion and contraction, like a giant heart.
I don't literally believe any of that, but it's fun to exercise one's mythical imagination sometimes.