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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.