Because he finds it interesting that he can't read her thoughts
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if you are refering to the cafeteria scene when Bella asks him what would happen if he ate food then Edward picks up a slice of pizza and takes a bite of it before trowing it back on the plat. Then Bella takes a bite out of the same lice of pizza.
Bella asks him if he could eat human food - and he said 'you can eat dirt, right?' and h does then
When? He said, "Edible Art," When before Bella dropped the apple.
Edward will forever be 17, and Bella will be 18.
Edward left Bella in the woods outside her house.