If you are referring to the cult classic ABC sitcom Happy Endings (2011–2013), the story follows six best friends in Chicago whose group dynamic is tested when the "perfect couple" among them, Dave and Alex, break up at the altar. The "proper story" of the show is about how the group refuses to choose sides and instead navigates their messy, co-dependent lives together.
This is a famous metafictional short story often studied in literature. It provides several different scenarios (labeled A through F) for the lives of a couple named John and Mary: The Happy Ending
The "perfect" life where they marry, have children, and die of old age. If you are referring to the cult classic
Widows or divorcees finding companionship later in life. Dave and Alex