Making an impossible island

Why do we stay connected with people we obviously despise?

You'd think in a world with 6 billion people in it, we'd be able to give one up. We can't. We're humans, and we stick to what we do better than any species that's ever come before or after us, which is connect.

From someone you don't know, but know you won't like, to someone that's wronged you in ways you wouldn't wish upon your most wicked enemy, they all seem to stay in your phone's contact list some way or another.