Be it a single lumen or roaring bonfire, my feelings for him burn purple; Pink (love) + Blue (lust).

Depending on the fuel, green flames may erupt. Walking side-by-side Envy and Jealousy stare at him.
One wants what he has; the other resents him for it.

When he pisses me off one more color presents itself.
My window panes glow red from within with wrath.

Thankfully; pink overpowers all the others. Thus are the colors of unrequited love.