carry a torch for
US /ˈkæri ə tɔːrtʃ fɔːr/
UK /ˈkæri ə tɔːrtʃ fɔːr/

1.
memendam cinta, mencintai seseorang secara sepihak
to have strong feelings of love for someone, especially someone who does not feel the same way about you
:
•
He still carries a torch for his ex-girlfriend, even though she's married now.
Dia masih memendam cinta untuk mantan pacarnya, meskipun dia sudah menikah sekarang.
•
She's been carrying a torch for him since high school, but he never noticed.
Dia sudah memendam cinta padanya sejak SMA, tapi dia tidak pernah menyadarinya.