" And over such a trivial issue, after all their years together! She couldn't even exactly remember the issue! Why that particular one? Why not any of the hundreds of others?

Once again Michael hesitated, but then he turned toward the foyer. She heard the front door latch, and a moment later his car lights lit up and backed out of the driveway. She went on staring straight ahead of her. She had a slippery, off-balance feeling, the feeling a person might get if she were sitting on a stopped train and the train next to hers started gliding away and she wasn't sure, for a second, whether it was her train or the other one that was moving. "

― Anne Tyler , The Amateur Marriage