What are your thoughts? Do you believe this is a convincing line of reasoning? Do you believe love can be explained naturalistically? Or do you believe that love doesn't actually exist?
I think love makes rather good sense from a natural perspective, compared to a non one.
From a Naturalistic perspective (This is just me guessing)
What could the general purpose of love be? To form a connection between two or more individuals.
Why would love be important? It gives comfort, which ultimately give security.
If the purpose of lifeforms is to survive, it would make sense in certain species to form strong bonds, as it makes the procreation a lot easier. The reason for that it that offspring within certain species, like humans, take a long time to be able to survive on their own, mainly due to our brain, that requires a long time to develop.
Now if we imagine that humans felt no love. First of all, any woman being late in her pregnancy would be extremely vulnerable, as the man or group would leave her behind, so to the point where I would personally expect a death rate of almost 95%, assuming we are talking early humans here, where we were not top of the food chain. A pregnant women, unable to run very easily, having to spend a lot of energy to simply gather food and dealing with all the other things and complications that comes with pregnancy, would make them easy prey for anything that would eat us.
Now assuming that a woman managed to survive long enough to give birth and doesn't die during it, they now have to carry around a small baby, which cries etc. Not making it any easier to gather food than when she were pregnant. The chance of her baby giving her away to a predator is huge in this whole period, so the chance of her or the child to survive long enough for her to not having to take care of it, is very slim.
Having humans and other types of animals share and work together in this whole process greatly increases the chance of our species ability to survive. Now, if we had no love for each other, first all, the woman would leave the baby behind and not even look back, so it would die very fast. The man would leave the moment he got bored of the woman.
So love, as I see it, is a mechanism for survival, it binds individuals together and therefore increases their chance of survival.
That as I see it, would be the naturalistic explanation, purely based on me guessing.
From a non Naturalistic perspective (Religious) that love is something from God. What is the purpose of it?
No clue to be honest.