is this it?
Remember by Christina Rosetti
Remember me when I am gone away,
Gone far away into the silent land;
When you can no more hold me by the hand,
Not I half turning to go, yet turning to stay.
Remember me when no more day by day
You tell me of our future that you planned:
Only remember me; you understand
It will be too late to counsel or pray.
Yet if you should forget me for a while
And afterwards remember, do not grieve:
For if the darkness and corruption leave
A vestige of thoughts I once had,
Better by far you should forget and smile
Than that you should remember and be sad.