The Rest of Our Lives by Ben Markovits

When Tom Layward's wife had an affair twelve years ago, he resolved to leave her as soon as his youngest child left the nest. Now, while driving his college-bound daughter to Pittsburgh, he remembers his promise to himself. He is also on the run from his own health issues and a forced leave from work. So, rather than returning to his wife in Westchester, Tom keeps driving west, with the vague plan of visiting people from his past -- an old college friend, his ex-girlfriend, his brother, his son -- en route, maybe, to California. He's moving towards a future he hasn't even envisioned yet while he considers his past and the choices he's made that have brought him to this particular present