Yes, flicker of love maybe remain a little, but if you give fuel, it will burn again. From what I know, unrequited love was very easy to shake off cause the person you love didn't help to flourish your feeling. Eventually it up to you, want to make your old love burning again or let it go. If you want to stop missing him, you must try to missing someone else (New feeling for someone else able to cover your old feeling to him)
MeLola