喜新厌旧喜新厭舊

xǐ xīn yàn jiù

ㄒㄧˇ ㄒㄧㄣㄧㄢˋ ㄐㄧㄡˋ

Idiom

1lit. to like the new, and hate the old (idiom); fig. enamored with new people (e.g. new girlfriend), bored with the old