There were many things about WALL-E EVE loved, but many of those same things confused her. Perhaps the most important thing about WALL-E that left EVE confused was that he had fallen in love with her at all. Despite it all, he had fallen in love with her.
The first time they met, she put an Ion Cannon to his face.
Whenever he had tried to show her affection before, she would callously ignore him.
Worst of all, because of her directive, he had almost died.
How could he love her after all that, EVE wondered. What had she done that was worthy of such undying affection? For a time, she simply let the question fester, content in knowing that no matter why HE loved HER, SHE loved HIM with every bit of data she had. Eventually, however, she simply needed an answer.
So one morning, when the little cube rolled back into their home from his sunrise re-charge, she lifted her hand to his and intertwined their fingers in that wonderful way, that mysterious and magical connection that they both held as sacred. Eyes doubtful and uncertain, she looked up to him and asked simply, "Why?"
WALL-E tilted his head as if the question was no question at all. He then lifted his free hand up and pointed it at her. "Ev-ah." he answered softly.
EVE looked down at their hands, then back up into WALL-E's warm eyes. She understood. "WALL-E." she whispered, tightening their fingers together that much more.
How that little cube could hold so much wisdom in such a simple form confused EVE. She loved him for that too, though.