Evolutionists/atheists: can you explain why certain behavioral traits such as jealousy and suicide are almost exclusive to humans? For what purpose

of adaptability did homo sapiens develop these behavioral traits and how exactly do they aid in our evolutionary instinct for survival?

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Pikachu

Jealousy is a useful trait because it encourages resource guarding whether that be food, shelter or mates.
Suicided is, i suspect, a non-selected bi-product of the complex intelligence we enjoy.
It's not adaptive but not sufficiently maladaptive to be totally expunged.