Love is a word used to describe a concious decision we make to either love someone or not. Depending on the criteria one sets we choose when we love someone and when we no longer do.
If the needs of one are met and or the correct physical confirmations are present; biology takes a hand and we find ourselves using this word. In short we fall in love.
"When woman love us, they forgive us everything, even our crimes, when they do not love us, they give us credit for nothing, not even our virtues.-Honore de Balzac, novelist (1799-1850)