Helen Hunt Jackson - Two Truths

Darling,' he said, 'I never meant
To hurt you;' and his eyes were wet.
'I would not hurt you for the world:
Am I to blame if I forget?'

'Forgive my selfish tears!' she cried,
'Forgive! I knew that it was not
Because you meant to hurt me, sweet-
I knew it was that you forgot!'

But all the same, deep in her heart
Rankled this thought, and rankles yet,-
'When love is at its best, one loves
So much that he cannot forget.'

Helen Hunt Jackson

http://www.poemhunter.com/poem/two-truths/