There's a concept that humans are very naturally pulled to, where your brain gets so used to something, it stops being grateful in a sense.
Hedonic adaptation or “the hedonic treadmill” are terms that define how people generally return to the same level of happiness despite their circumstances.
www.verywellmind.com
the concept is called
hedonic adaptation. I think this much more applicable than who s"settled" and attraction and all that. Because probably all of us have experienced this, even if we aren't married.
Hedonic adaptation is an adaptation-level phenomenon, which is a term that describes how humans become insensitive to new stimuli, and quickly readjust to an emotional baseline. Therefore, the stimulus needed to create an emotion—like happiness or excitement—needs to be more intense than the last stimulus in order for someone to feel its effects