A tribe is a group of people who act as a single unit instead of multiple individuals. A marriage is the same with two people.
Love is the unconditional, unequivocal commitment to the welfare of another. This makes it very susceptible to abuse - you can simply use a loved one for endless money, sex, or labor for example.
Much of society has formed to protect individuals against the abuse of love, often to the point where we think love is evil. Restrictions on marriage, people are decoupled from their jobs, welfare is villainised. Unbounded love leads to tyrants and child abuse.
But love is still necessary for society to thrive. Love is by nature unbounded. And one of the hardest optimization problems of being human is deciding who to love.
> And one of the hardest optimization problems of being human is deciding who to love.
I truly agree. But then what do you look for in a relationship ? Cause to any optimization problems there are constraints and an objective function to push the metaphor ?
Just being able to give to someone. Children and pets are the best example for this. No matter how badly someone distrusts humans, they can at least rely on pets to give to.