If by forever you mean until you are six feet in the ground then yes, after that you're both just food for the maggots...
yup forever love also exist and the best example is my grand pa and mom they had love in their younger life they lived together happily.
Forever loves exist. I love my parents and my brothers. I adore my children, I am deeply in love with my Husband.
The saying goes that true love never dies... we're left with memories as remnants of it, but it never dies unlike the memories