Love
Old English lufu, from Proto-Germanic lubō; cognate with Latin libere (to please) and Sanskrit lubhyati (he desires). The word's oldest root is desire, not sentiment. Before it named a feeling it named a reaching.
We use the word love as though it names a single thing. It doesn't. What Carole was describing — the gradual recession of feeling, the beach revealed by what had quietly withdrawn — was not the absence of love but one of its many forms: the love that has been left unrecognized for too long, that has learned to need less and less until it stops needing altogether.
There is love that arrives with intensity and love that grows slowly, in the dark, like plants in rooms without much light. There is love that protects and love that possesses, love that gives freedom and love that calls freedom by the name of abandonment. The clinical question is not "do you love this person" — almost everyone loves someone. The question is: what does your love ask of them? What does it ask of you? And is the asking mutual?
Love that cannot ask this of itself tends to drift. Not into cruelty, not necessarily into loss — but into the particular sadness of a feeling that has never quite been examined, and so has never quite been known.