Tāmen zhǐshì lùshuǐ fūqī, méi guò duōjiǔ jiù fēnkāi le.
They were just a fleeting couple — they separated before long.
Tips
usage
露水 has a vivid figurative use: 露水夫妻 (lùshuǐ fūqī) means a couple in a short-lived or improper relationship. Like dew that evaporates quickly in the sun, such relationships don't last. 露水情缘 is a similar expression.
