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"But I did mind you, Pip," he returned, with tender simplicity. "When I offered to your sister to keep company, and to be asked in church at such times as she was willing and ready to come to the forge, I said to her, 'And bring the poor little child. God bless the poor little child,' I said to your sister, 'there's room for him at the forge!'" (7.3)
All this talk about Mrs. Joe being a superhero and bringing Pip up "by hand" is just plain silly. Joe saved Pip. If Joe hadn't intervened, he might have ended up like Magwitch, stealing turnips. In fact, maybe that's the only difference between him and Magwitch—Pip had a friend.
O dear good Joe, whom I was so ready to leave and so unthankful to, I see you again, with your muscular blacksmith's arm before your eyes, and your broad chest heaving, and your voice dying away. O dear good faithful tender Joe, I feel the loving tremble of your hand upon my arm, as solemnly this day as if it had been the rustle of an angel's wing! (18.93)
Pip may be a butthead, but he's not blinded by wealth. The fact that Pip and Joe are such great friends makes Pip's decision to leave the marshes all the more significant. Pip's dreams of winning Estella outweigh his love of Joe. In other words, he totally betrays the bro code.