“喜新厌旧”，汉语成语，字面意思是“喜欢新的，厌弃旧的（be fond of the new and tired of the old）”。多指对爱情不专一。可以翻译为“abandon the old for the new，be fickle in one’s affection”等。

例句：

这一部分是因为我们喜新厌旧的天性。

This is partly because we are by nature easily bored.

她是一个喜新厌旧、肤浅、自负的女人，会让你沦为笑话。

She is a jaded, shallow, conceited woman that will make a joke of you.