Dan and Swampy (creators of the show) say that in the 3rd season, their relationship will be further explored. So, probably in the 3rd season, you'll see Isabella showing her feelings more. I hope this helped.
No. Phineas has no interest in Isabella, however Isabella has a HUGE crush on Phineas
Because Isabella loves Phineas!
Isabella is Phineas's friend that has a crush on Phineas and is played by Alyson Stoner. Isabella always says, "What Cha Doin'?"
Isabella is Phineas and Ferb's best friend and Isabella has a major crush on Phineas and Isabella is played by Alyson Stoner. She always says "Watcha doin" and Phineas tells her his idea.
As far as the series has gone, Isabella was never Phineas's girlfriend.
Phineas has a Crush on Her. Phineas Asks Isabella if she Wants to go on a Romantic Cruise. And he takes her hand through a haunted House (One good scare oughta do some Good) And Phineas Flirts with Isabella and Isabella Flirts Back. (The Beak)
Isabella
isabella
Yes but Phineas doesn't know it
Phineas is Isabella's true love!
Isabella garcia-shapiro
its the paring of Phineas and Isabella in the tv show Phineas and ferb