RESUMEN
Lies can have major consequences if undetected. Research to date has focused primarily on the consequences of deception for receivers once lies are discovered. We advance deception research and relationship science by studying the social consequences of deception for the sender-even if their lies remain undetected. In a correlational study of video conversations (Study 1; N = 776), an experimental study of text conversations (Study 2; N = 416), and a survey of dispositional tendencies (Study 3; N = 399), we find consistent evidence that people who lie tend to assume that others are lying too, and this impedes their ability to form social connections. The findings provide insight into how (dis)honesty and loneliness may go together, and suggest that lies-even when undetected-harm our relationships.