It is okay for humans to develop pair bonds. But sometimes we have to be apart, whether we are humans or other sorts of animals. If we get really scared when we are separated it makes it hard to do things like go out and get food. So that's why it is important to be ok with being apart sometimes.
jam-and-Tea t1_j6lttan wrote
Reply to ELI5 - why are bonded pairs okay in animals but not humans? by Pokemonobsessedlesbo
It is okay for humans to develop pair bonds. But sometimes we have to be apart, whether we are humans or other sorts of animals. If we get really scared when we are separated it makes it hard to do things like go out and get food. So that's why it is important to be ok with being apart sometimes.
edit: That's assuming pair bond = life companion