Juristis
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True, pure love is given only by God. It does not have, nor does it carry, any negative emotions! There is no such thing as unhappy love!
For example, you fall in love with someone and suffer because the object of your affection does not love you. This is not love – it is egoism!
It turns out that you want the object of your affection to love you. It is presumptuous to want everyone we supposedly love to love us back.
Unrequited love does not exist; we only call it that. In reality, it is simply not love, but a desire to make someone fall in love with you (to force them to love you).
Love is only mutual; everything that is not mutual is not love.
As for 3-4 years, that's not about love either. Attachment is not love, and they cannot be put in the same category.
Love requires constant nurturing.
Whether it's mutual or not, why elevate a feeling that is not unique? Almost all people experience it; there is nothing sublime about it, it is just a good feeling, like many others.
Regarding Darwinism and "chemistry" in the brain, a friend of mine says exactly the same thing. It is quite possible that this is the case; a bunch of processes are triggered, but I do not see the point in such an interpretation of the word. It can only explain something to some scientist.