Cleo Sertori and Lewis McCartney have been friends since they were kids,but now they're dating! =) Ok but in the start of season2 the break up!Because cleo thinks that lewis is trying to fix EVERYTHING FOR HER,and its making her crazzy! so after the break up a new girl named Charlotte thniks its ok to date lewis!!!and latter on in the season Charlottes becomes a mermaid,and she thinks she is better than cleo,emma,and rikki!!!Near the end of the season Lewis is smart and breaks up with Carotte after sge tells him that he cant even talk to Cleo!!!But she forgives him and they get back together! =)