Which love are you talking about precious?
Mankind have mistaken the term lust for love. Love is that care and self sacrifice you give to fellow humans and other creatures of this world. But lust (or passion) is the romantic feeling you have towards an opposite sex.
This is what many erroneously call love.
I believe that love (care for nature and humanity) lasts a lifetime. But lust burns like candle and extinguishes when the wax that fuels it is out used.