喜新厌旧

喜新厌[嫌]旧 [xǐ xīn yàn jiù]

1. ■ be fond of the new and tired of the old; abandon the old for the new; be fickle in one's affection; reject the old and crave for the new; tired of the old and fascinated by the new (lover); turn his [her] back on one lover to go with another; (a man) who would discard the old as soon as he had sth. new