Evolution hasn't explain the facts, you have not established that, no one here has, saying so doesn't change that! People here talking about baldness and fingers. Give me something to work with!
Alrighty, I'll try to explain how evolution can result in the phenomenon we know as "love". Story time!
Let's imagine a hypothetical species, that has no social structure. We will call them "Hoomans". They don't live in groups. They give birth, then go their separate ways. They are complete loners.
One day, a Hooman called Bob is born. Bob is a bit defective. For some reason, Bob likes to follow around other Hoomans. No one knows why Bob does this, and it doesn't really matter. Alice is a normal Hooman, but she reluctantly tolerates Bob tagging along behind her. Oddly enough, Bob and Alice do really well together. Together, they are more easily able to fight off predators. They can share food when one of them is hurt. There are drawbacks of course: they have to gather twice the amount of food from the same area, they are easier to spot, etc. However, in this case, the advantages outweigh the drawbacks.
Alice and Bob have a baby. Oh no! Bob's baby also has this defective "Bob gene", that causes him to follow around other Hoomans. However, like Bob, he does pretty well for himself. As it turns out, any Hooman with the "Bob gene" has a 60% rate of survival, compared to the 40% rate of survival for the average Hooman. Hoomans like Bob steadily become more common. The Bob-like Hoomans start forming small social groups, which becomes very beneficial to their survival. Other character traits develop in the same way that Bob's character trait developed:
The desire to fiercely protect fellow tribe members.
The desire to fiercely protect the tribe's young.
The desire to stay with the tribe.
Sadness at another tribe member's pain, which motivates them to try to relieve that pain.
etc.
The more of these group-beneficial traits a tribe has, the more successful they tend to be. Perhaps none of these traits by themselves is exactly what we would define as "love". But over time, these socially beneficial traits change and mix and over time, they begin to resemble the phenomenon that we call "love".
Obviously, this is just a hypothetical situation, but it demonstrates a possible evolutionary mechanism behind love. Since your argument seems to be "evolution can't result in love", I think this satisfactorily refutes your argument.
Edit:
I would like to add, that once the Hoomans start grouping up into tribes, none of these traits has to be directly beneficial to the
individual. They just have to be beneficial to the
tribe as a whole. Sacrificial love is obviously not beneficial to the survival of the individual, but it can definitely be beneficial to the tribe as a whole. Therefore, the tribes with a "sacrificial love trait" tend to do better than the tribes without it, and the "sacrificial love trait" gets passed on by those tribes.