说好一起要白头你却偷偷焗了油
[shuō hăo yī qĭ yào bái tóu nĭ què tōu tōu jú le yóu]
In a somewhat lighthearted tone, it expresses disappointment when one expected to grow old gracefully with someone else (referring often to love relationships), only to find out this person had unexpectedly chosen artificial beauty (such as getting an oil treatment to maintain youth or vanity instead).