水性杨花 fickle woman
Explanation
比喻女人在感情上不专一，像流水那样变化无常，像杨花那样随风飘荡，没有固定。
The idiom is used to describe a woman who is not faithful in her relationships, like water, which is constantly changing, and like a willow flower, which is carried by the wind, without a fixed direction.
Origin Story
古时候，有一个书生名叫王生，他与一位美丽女子结识，二人情投意合，很快便坠入爱河。女子名叫柳如烟，生的貌美如花，却生性多变，喜新厌旧。王生对柳如烟的爱意十分真挚，倾尽所有，对她百般呵护。然而，柳如烟却对王生始终保持着若即若离的态度。不久，王生发现柳如烟与其他男子来往密切，心中隐隐不安。他多次询问柳如烟，但柳如烟总是含糊其辞，支支吾吾。王生越发怀疑，终于有一天，他亲眼看到柳如烟与另一个男人卿卿我我，心中顿时醋意大发。王生气愤地质问柳如烟，柳如烟却毫不在意地说：“这有什么，我只是喜欢新鲜的东西，你已经陪了我这么久，我自然会想要换一个。”王生痛心疾首，意识到柳如烟就是一个水性杨花的女人，最终选择了离开她。
Once upon a time, there was a scholar named Wang Sheng who met a beautiful woman. They fell in love at first sight and quickly became a couple. The woman was named Liu Ruoyan, who was as beautiful as a flower, but also fickle and prone to change. Wang Sheng loved Liu Ruoyan sincerely, gave her everything, and cherished her in every possible way. However, Liu Ruoyan always maintained a distant attitude towards Wang Sheng. Soon, Wang Sheng noticed that Liu Ruoyan was having close ties with other men, and he felt uneasy. He asked Liu Ruoyan many times, but she always answered vaguely and evasively. Wang Sheng became more and more suspicious, and one day he saw with his own eyes Liu Ruoyan being affectionate with another man. He was immediately overwhelmed with jealousy. Wang Sheng angrily questioned Liu Ruoyan, but she didn't care and said,
Usage
这个成语用来形容女人在感情上不专一，感情变化无常。
This idiom is used to describe women who are not faithful in their relationships and whose feelings are fickle.
Examples
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她就像水性杨花一样，身边总会有不同的男人。
ta jiu xiang shui xing yang hua yi yang, bian shang zong hui you bu tong de nan ren.
She's like a fickle woman, she always has different men around her.
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他这个人水性杨花，一点也不可靠。
ta zhe ge ren shui xing yang hua, yi dian ye bu ke kao.
He's like a fickle man, you can't rely on him.