 The friendship that Lana shares with Chloe was deeply damaged at the start of season three , so much so that not even Kreuk realized how badly until the episode " Truth " . Lana is aware that Chloe still has romantic feelings for Clark , but their friendship suffered the most when Chloe revealed that she had known where Clark had been hiding for months . The feelings of distrust for Chloe remained hidden until " Truth " — where Chloe gained the ability to have others speak the truth no matter what — when Lana finally revealed how much she cannot trust Chloe . This developing friendship between Lex and Lana puts a strain on Lana 's relationship with Clark . Just as Clark is beginning to realize the truth about Lex and his lies , Lana is starting to trust Lex more . Ultimately , it is Clark 's own lack of honesty that forces Lana to leave Smallville and go to Paris at the end of season three . In the end , Kreuk believes that Clark is Lana 's only true friend , as Lex is more focused on bringing his father to justice and she and Chloe have a tense relationship based on their mutual feelings for Clark . 
