Great Expectations: Question

In this book there are SO many confusing parts that I have no clue what it's suppose to mean, but this quote of when Estella talked to Pip I couldn't figure out what Estella was trying to tell Pip "You must know," said Estella, condescending to me as a brilliant and beautiful woman, "might,that I have no heart- if that has anything to do with my memory."


no matter how I read that over and over I just don't seem to understand what Estella is trying to tell Pip. Is Estella trying to tell Pip that she has no emotion at all? or is she threatening Pip? or making fun of Pip like she usually does?