Trust is built in small moments of attuning to our partner, and listening like a friend and ally when our partner is experiencing a negative emotion—sadness, anger, disgust, or fear, even if those emotions are about us. In all of our decisions we’re thinking of maximizing our partner’s benefits as well as our own. Mutual trust rests in the belief that both of us are thinking for two. We aren’t negotiating for the best deal for just ourselves. We’re always considering the cost of any choice for our partner, too.