Question: when does nate find out about chuck and blair

title: The Thin Line Between Chuck and Nate
text: Meanwhile , Dan attempts to say a proper `` I love you '' by having a romantic picnic in the park , only to get derailed when Serena 's English paper gets blown away . Everyone see the news about Blair when school lets out . Nate initially believes that it must be a lie , but Jenny , who overheard Serena 's conversation with Dan the previous night , tells him the truth . Nate gets into a fight with Chuck over the whole thing , then tells Blair he wants nothing to do with her . She is quickly overthrown as the queen bee , with Jenny joining the popular group . Serena asks Dan if he told Jenny anything relating to Blair , so he says he would n't do something like that to her because he loves her .