Is it true love or fake to love someone up to the point of blank then you no longer love them, but despise them?

Thinking on the concept of love, some believe it is limitless; some fool themselves into thinking it is limitless. Often in reality love has conditions and limits. What depths can love actually survive? To love someone up to the point they fill in some negative, then they stop loving the person, and in many cases loath the person from then on. If one can switch their love to hate, even if they were supposedly in love many, many years, were they truly in love or just living long-term in a fake love?