When a backstabbing, male, female, or another gender, that is seen as a bitch, promises an action or behavior that is perfectly reasonable and expected, and they refuse to follow up on the promise. Also can be simply defined as betrayed by a bitch.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.