吃着碗里，瞧着锅里
chī​zhe​wǎn​lǐ​qiáo​zhe​guō​lǐ

to have a wandering eye

吃着碗里，瞧着锅里 吃著碗裡，瞧著鍋裡 chī​zhe​wǎn​lǐ​qiáo​zhe​guō​lǐ
to have a wandering eye
Literal meaning is to eye what is in the pot while eating from one's own bowl; used to describe being greedy or not content with what one already has, especially regarding romantic relationships.