 The beginning of season five saw , for the first time , Clark and Lana in a happy relationship together , one that was void of dishonesty and secrets . The return of Clark 's powers in " Hidden " , as well as the secrets and lies that accompany them , caused stress on their relationship . In the series ' 100th episode , Clark finally took a chance and told Lana the truth . When it resulted , indirectly , in her death and he was allowed to live the day over again Clark chose not to tell her his secret . In " Hypnotic " , in an effort to stop hurting Lana emotionally , Clark told her that he no longer loved her . This drove Lana into Lex 's arms . Writer Darren Swimmer explains that this was not something that just happened in the series , but something that had been hinted at for many seasons . Swimmer believes that Lana started dating Lex as a way of making Clark mad , but the relationship " turned into much more " . Kreuk contends that Lana went to Lex because " she knows she will never really love him . " Kreuk believes that Lana 's relationship with the men in her life has been motivated by a desire to fill a void in her life that was left after her parents were killed . This need to fill that emptiness was fulfilled in " Void " , when Lana took a drug to induce death so that she could see her parents in the afterlife . Upon meeting her parents , Kreuk believes that Lana realized that she no longer needed someone else to fill that hole in her . Kreuk sees this filled void as the reason why Lana would gravitate toward Lex . Although she did not truly love Lex , Kreuk argues that Lex was not a rebound guy and that Lana did have feelings for him . " 
