Absence Makes The Heart Grow Flounder

One of the biggest reason when Russian are divorce each other after 30 years marriages is that "...practically we don't see  each other anymore..." Fair enough after 30 years... you have seen enough each other... what else left to see! Certainly their absence didn't  make their hearts grow fonder, is this because the weather or the hearts? After 30 years marriage the hearts stop pumping! You can imagine why? Need hearts transplant?! Seriously, when a love is user by date? Where the love has  to go?