Why is love necessary and why do we love?

basically every human being having sixth sense that is the one which expressing love,love has different meaning according to me caring at correct situation , mutual understanding , recognizing,then only affection , lust comes in to play tese are the reactions of hormones.thats it nothing oter than that according to me.

Emotionally, yes I think it does fulfill part of our needs. Some say love inspired them to do things which they can't do before. Love is the foundation of feeling that if we let others received it could keep us immortal, not physically, but in their hearts and mind. Thant's how I see it.