The boys , now middle - aged men with families of their own , confess that they had loved the Lisbon sisters , and despite their life - long efforts , will never understand why they chose to be alone in suicide for all time .
The boys , now middle - aged men with families of their own , confess that they had loved the Lisbon sisters . 
 In spite their life - long efforts , will never understand why the girls made them participate in their deaths , and chose to be alone in suicide for all time .