我该怎么感谢你赐我空欢喜
[wŏ gāi zĕn me găn xiè nĭ cì wŏ kōng huān xĭ]
Translated as 'how can I thank you for giving me false hopes?' It conveys disappointment and gratitude at the same time; thanks for providing something desirable yet ultimately unattainable leading only to disappointment.