Edward had a perfect vision in his head.  He would take Bella to an upscale restaurant.  They would eat great food while talking and joking with each other.  Bella would thank him and ask to come back sometime soon.  Then, they would go to the art exhibit.  Bella would be thrilled and enjoy it so much!  She would have so much to say about each piece and he couldn't wait to hear her take on what the artist might have thinking when he created each work of art.

Edward didn't get his perfect vision and he didn't know how to handle it.  Instead of admitting he had not given her the "small" he'd promised, he put it all on Bella and blew up at her.  Sometimes, stress makes people say and do stupid things.