Mad Men's Insidious Heartbreak

Heartbreak unfolds insidiously in “Mad Men” — the heartbreak of dreams slowly lost, of marriages slowly decaying, of characters falling into hamster wheel habits that do nothing but wreck their emotional lives.
But in the penultimate episode of the series, heartbreak hit like a brick wall as we learned that Betty, on the heels of embracing her identity as a psychology student, has terminal lung cancer and has decided to refuse treatment.
The diagnosis arrives after Betty, out of breath on the stairs at school, takes a fall and breaks a rib.