Why Do We Get Jealous?

At times, we all feel jealous, but why? Why did humans evolve to get jealous?

Read More:
Upset Over Sexual versus Emotional Infidelity Among Gay, Lesbian, Bisexual, and Heterosexual Adults
http://link.springer.com/article/10.1...
“One hypothesis derived from evolutionary perspectives is that men are more upset than women by sexual infidelity and women are more upset than men by emotional infidelity.”

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