the idea is..

If you forget me
by Pablo Neruda

I want you to know one thing.
You know how this is:
if I look at the crystal moon,
at the red branch of the slow autumn at my window,
if I touch near the fire the impalpable ash
Well, now, if little by little you stop loving me
I shall stop loving you little by little.
If suddenly you forget me do not look for me,
for I shall already have forgotten you.