William Congreve - False though She be

FALSE though she be to me and love,
   I'll ne'er pursue revenge;
For still the charmer I approve,
   Though I deplore her change.

In hours of bliss we oft have met:
   They could not always last;
And though the present I regret,
   I'm grateful for the past.

William Congreve

http://www.poemhunter.com/poem/false-though-she-be/