User blog comment:Soneas/What will be different in Season 4?/@comment-65.100.83.9-20120613034339/@comment-1896159-20120613204741

Their relationship has not really been explored that much in Season 3, but notice that there's significant change with how Phineas acts around Isabella. They held hands during the S'Fall song, they shared a ride in "What a Croc!" and he almost said that he thinks Isabella is really cute in "Meapless in Seattle".