天荒地老几分钱海枯石烂我买了
[tiān huāng dì lăo jĭ fēn qián hăi kū shí làn wŏ măi le]
A hyperbolic expression implying undying love by suggesting he bought eternal time for his love when heavens fall, the earth wears down and the sea dries up even though these changes are worthless and impossible. It's a whimsical expression of eternal love.