Ingredients of a Puzzle

A mosaic is forming,
A sprinkle of unplanned smiles,
an equal amount of denial
One part butterflies, an elephant to complement the rest
A generous helping of semi-sleepless nights
and a dash of daydreams to bring out the flavour
A pinch of relatability seeps into every sound and space imaginable
A teaspoon of acceptance,
then masked with a tablespoon of resistance
and repeat
until there’s an unidentifiable mixture

The aroma appears 
bittersweet, this two-part word,
Which will describe the inevitable aftertaste?