A wave implodes,
impaled upon
impassive rocks...

this evening
the thunder of the sea
is a wild music filling my ear...

you are leaving
and the ungrieving
winds demur:

telling me
that nothing returns
as it was before,

here where you have left no mark
upon this dark
Heraclitean shore.

Heraclitus said we can't step in the same river twice, because it won't be the same river and we won't be the same either. Everything is in a constant state of flux, thus "nothing returns / as it was before." Lovers who part will not be the same people if they reunite later.