Love…
…unrequited is still love. Some of the greatest romances told were known only to one person with unreciprocated love carried as a secret song in a single heart.

From Don Juan by Anglo-Scottish poet Lord Byron
Then
there were sighs,
the deeper for suppression,
And
stolen glances,
sweeter for the theft,
And
burning blushes,
tho’ for no transgression,
Tremblings when met,
and restlessness when left.