A lot of us want to do whatever we damned well please. We want multiple partners. But we are angry as hell if our mate does it. It's because people are competitive. Our innate urge is to one-up each other and control resources and others' access to those resources. We see the world as a zero-sum game wherein if we have what we want then no one else does. It takes conscious effort to break this.
When your partner is seeing someone else, a resource that you thought you had sole access to, is being accessed.
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