"Corruption"

I agree with the quote that Pip changes are based on his interactions with different people. Like in the story before he met Estella he wasn't worried about being a gentleman . But meeting Estella all that all of a sudden matter to him. He wanted Estella to take interest in him. But to be honest it happens to everyone. Once you hang out or be around a certain type a person or group you start acting just like them so that they can see that you are just like them.