A couple who is madly in love but denies it in public. These type of couples always fight and pretend to hate each other in public but deep inside they love each other very much. They are couple goals!

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.