According to a Western legend, it is said that after death, a person will be 21 grams lighter than before life. That is the weight of the soul. If a person tells you that he gives you a net weight of 21 grams of love, then she is hinting to you that she is loving you with her life. Even if one day, someone will leave, this love will not disappear because of the disappearance of life, it will only become deeper and more eternal with the soul.
We can never stop loving until we die. Or there may be no love in this world, but we still believe that there is love.