Why does my friend NEVER think she's in the wrong?

Why does she never seem to think she's done something wrong?

Every time my friend does something (like speak behind people's backs) she lies and says she never did it and plays the victim. She was caught out doing something EXTREMELY rude and mean to her boyfriend's friend. The boyfriend's friend confronted her about it, and it turned into a screaming match where my friend again played the victim, called him a "liar" and said she never did anything wrong. She has banned me and her boyfriend from speaking to the friend now.

Anyone who goes against her, is horrible in her world. never her. Why is she never wrong about anything and never says sorry?

Why does my friend NEVER think she's in the wrong?
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