他换了发型我换了心
[tā huàn le fā xíng wŏ huàn le xīn]
'He Changed His Hairstyle; I Changed My Heart.' This expresses the profound effect another individual can have over us, signaling a shift of emotion, maybe a breakup and moving on when the person saw changes in the other one - likely an ex partner or loved one. It carries a tone of nostalgia, perhaps with a hint of sarcasm or acceptance.