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"You have not every reason to say so of the rest of his people," said Estella, nodding at me with an expression of face that was at once grave and rallying, "for they beset Miss Havisham with reports and insinuations to your disadvantage. They watch you, misrepresent you, write letters about you (anonymous sometimes), and you are the torment and the occupation of their lives. You can scarcely realize to yourself the hatred those people feel for you." (33.22)
Here's a pretty good example that lying about someone just makes you look bad. Miss Havisham sees right through this Mean Girls gossip and loves it.
There was a gay fiction among us that we were constantly enjoying ourselves, and a skeleton truth that we never did. To the best of my belief, our case was in the last aspect a rather common one. (34.8)
This is like someone posting a bunch of party pictures on Facebook in the attempt to convince her friends (and herself) that she is having the time of her life, when really she's exhausted and doesn't even like parties. Pip and Herbert are trying to keep up with society, but they're just hungry and getting into debt.
"Do you want me then," said Estella, turning suddenly with a fixed and serious, if not angry, look, "to deceive and entrap you?" (39.105)
Hm. When we think about it, Estella just might be one of Great Expectations' only honest characters. She's never tried to lead Pip on, but she's been cold and haughty all of her life. She just doesn't care enough to lie.