Because he has a crush on her and he thinks shes pretty
The episode you're looking for is called "Isabella and the Temple of Sap.
Of Course She Will Marry Phineas. Because In the Episode ''Phineas and Ferb's Quantum Boogaloo'', It was said by Amanda, the daughter of the future Candace, that Isabella looks like her Aunt Isabella. So Isabella thought that is was going to be Phineas because of the fact that she doesn't have a crush on Ferb but was stunned when future Candace said that it could be Ferb. But I think it will be Phineas that Isabella is going to marry because of Ferb having a crush on Vanessa, Dr. Heinz and Charlene Doofenshmirtz's daughter. But also Vanessa has a crush on her classmate, Johnny.
In the episode "Phineas and Ferb's Quantum Boogaloo", when Candace's child refers to Isabella as "Aunt Isabella", Isabella exclaims that this means she will marry Phineas. Then, Candace points out that she could also marry Ferb. So basically, Isabella probably marries one of the two brothers, but which one is still unannounced.
Of Course She Will Marry Phineas. Because In the Episode ''Phineas and Ferb's Quantum Boogaloo'', It was said by Amanda, the daughter of the future Candace, that Isabella looks like her Aunt Isabella. So Isabella thought that is was going to be Phineas because of the fact that she doesn't have a crush on Ferb but was stunned when future Candace said that it could be Ferb. But I think it will be Phineas that Isabella is going to marry because of Ferb having a crush on Vanessa, Dr. Heinz and Charlene Doofenshmirtz's daughter. But also Vanessa has a crush on her classmate, Johnny. So the story is all mixed up and I really don't know what happened.
'Cause Phineas is on crack, meth, cocaine, bong, pot, weed, wiffledust, and marijuanna.
In the newest episodes (post sbty) it is shown that Vanessa has a boyfriend, after that she is not in the episodes that often but Ferb starts to talk more and gets closer to isabella. We probably will never find out who Izzy marries but that's what Disney is about.
Vincent Martella. Vincent looks a lot like Fred, and has the kind of same voice. They both look alike, and they both can do weird voices!
I say Ferb looks 16 yrs.
it is three dimensionalIt looks like a rectangular prism.
It looks like lines stuck together to make a closed figure
It looks like a closed mouth.
looks like there site closed down..