There is also a darker metaphor for depression and suicide on the first half. The absent family and friends symbolize their inability of helping the depressed person, seeking shelter from the cold. The girl that nearly froze to death was suicidal, and the clothes offered to her is the hope that kept her going. And so, the depressed couple can no longer lose to the depression, because not only does one support another, but one of them dying means the sure death of the other, aswell. It's bittersweet in its own way, i believe