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Well, if we look Isabella's daydream, it is possible to marry Phineas. Isabella likes Phineas in Grade School, but she gave up. And it's Phineas turn to like Isabella, since they're in High School, but he would never admit his feelings for her. But near 2 weeks before their summer is ended, Phineas and Isabella admit their feelings for each other... (FOR REAL THIS TIME). And they started their romantic affairs each other in College. (Summary to the episode "Act Your Age")

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