the.com/dissatisfaction
The gap between what you got and what you swore you deserved.
means A state of being unhappy or unfulfilled because something falls short of your expectations.
from From Latin satis, enough, dressed in the negating dis- — literally not-enough-ness, the math of perpetual wanting.
Engine of progressEvery invention began as someone refusing to settle.
Hedonic treadmillSatisfaction fades, so the gap reopens fast.
Quiet cousinLess dramatic than anger, more corrosive over time.