why is it said as A FREN IN NEED IS A FREN INDEED?

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Frens are made to care for each other. But it's not always necessary to be so. A true fren gives unconditional love. In that case if u consider a fren as fren only if he/she helps u wen u need, is it rue frenship??? Just like a lover who wants his/her love to be happy n safe werever he/she is....a true fren also wishes the same without considering need/help...what do u say now???