bad choices

My sister N fell in love with a guy I knew well enough to know she shouldn't. He was handsome, passionate and well-spoken, but completely insincere. I was going to warn her off, but I didn't have to: as she and I wandered around New York (?) on the eve of her wedding, we found out that the reason he needed to marry her was that he was about to be homeless, and that he had been living with somebody else.

I went home thinking she had been saved from marrying a total loser, but in the morning I passed a bunch of my siblings eating breakfast at a diner, and they were all gushing about the wedding to be. "She's still marrying him?" I couldn't believe it.

And then she did marry him, and she looked breathtakingly beautiful, and they appeared to be the perfect couple except that my sister looked a little sad. And the next morning, while I was still waiting to talk to her, the evil brother-in-law abandoned my sister, who was asleep in their bridal bed, with only a note. The whole huge family was shocked and homicidal -- except for me and N. She just smiled and whispered to me, "The last thing he said before we fell asleep was that we were forever! Isn't that hilarious?"