Huāxīn de rén hěn nán wéichí cháng jiǔ de gǎnqíng.
People who are fickle in love find it hard to maintain lasting relationships.
Tips
memory
花 (flower) suggests something that flutters from bloom to bloom; 心 (heart) — a heart that flits from one person to another like a bee in a garden.
usage
花心 is primarily used for romantic unfaithfulness. It can describe both men and women, though it is most often used about men. The extended phrase 花心大萝卜 (a fickle turnip) is a humorous colloquial intensifier.