Love is the human need for emotional connections. It's a biological imperative to propagate our species, but it can be just as destructive if left unchecked. Without love, there would never have been wars or genocides in this universe. Without love, we wouldn't care about anything beyond ourselves and our own survival needs.
We live in the Laniakea Supercluster of galaxies which has over a hundred billion sentient beings. We are not alone, but we certainly feel that way most of the time. Only a few million planets have life on them. The rest are either barren rocks or massive asteroid belts with only dust and gas.