"Appology accepted Captain Needa" Just kidding.. The reason for this is because this is pivital part of the story. He needs to establish that these two character are so deeply in love that they would risk it all to be together, when convention, the law and the rest of the universe conspire to keep them apart. In order to set us up for the heart break of Anakin's eventual fall, part of which she will be the key to. In order for the fall in EPIII, and the redemtion in ROTJ, to matter we must care about this character in more ways than just a Great Jedi who chose the dark path. In order for his fall to have meaning we need to care about him before he surrenders completely to the rage and hatred that turn Anakin to Vader.