A Patchwork Planet, by Anne Tyler

This book is about a 30-year-old guy named Barnaby, divorced with a 9-year-old girl that he sees once a month on a Saturday. He works for a place called Rent-A-Back, where he goes to the homes of the elderly & disabled to help with chores & heavy lifting. He meets a woman named Sofia on the train, and they begin dating. Because of his juvenile-delinquent past, his parents don't trust him. There are many interesting characters to meet, including many of the Rent-A Back customers. When his girlfriend tries to cover for a crime he did not commit, he begins to realize that things aren't so perfect in their relationship. Despite his past, he has become a man that people can trust.