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This is when someone is so full of themselves they think they're the only one who matters, and they say this to make themselves feel bigger, even though they know the other person is still breathing and probably hates them.
'I forgot you exist?' Like you were even on my mind?
You forgot I exist? You're still mad I didn't text you back at 2 a. m.
I forgot you exist? Oh, you're still here? I guess you're not dead yet.