While Gottfredson and Hirschi's general theory of crime is one of the most empirically tested theories of deviance, the theory offers hypotheses that range far beyond how self-control should affect behavior. This study is broadly focused on how self-control operates between friends by considering how the general theory's main construct relates to friendship conflict. Using a large dyadic dataset, three-level hybrid item-response models regress the actor's proclivity to experience conflict with the friend onto measures of the actor's self-control, the friend's self-control, and an interaction between the self-control estimates. Results demonstrate that the actor's and the friend's self-control both significantly relate to friendship conflict, as the theory would expect. However, the actor's and friend's levels of self-control do not interact.