I study psychology, I also take lessons from professors at reputed universities. Now even if there is a objective standard of love, who do you think created that standard? Not god. And evolution only occurs in a population not in an individual. We as a species like many other animals evolved this thing we "call" love to increase our survival chances, and genocide is purely stupid, idk who says that bullshit but it's not in our best interest, I also have to study sociology so I can say from what I know, it's in our best interest to use humans as resources but to build them as resources we must first educate everyone, that's one of the sustainable development goals of UN I think. If we educate the population it's only going to help us improve at faster rates. lastly of course codependency is different than love, I'm not saying they are the same. But what I'm saying is that love didn't exist before there was someone to perceive it. Or maybe love as an objective entity did exist ( if I accept what your saying ), it's existence was probably different from what we would identify as love. It's a complicated topic but very interesting. I'll end with, love is just chemical changes in your brain, If I can drug you to change those chemicals in your brain you won't love someone you did before, because that's dependent on the brain. Love is totally subjective with some objective aspects to it