Kate and Dan met on the job in Boston, when they were in their early 20s. He thought she was attractive; she thought he was an arrogant jerk. At a work party, it came out that both had lost a parent in recent years, and a mutual feeling of “you must really get me” washed over them. A few years later, when they both found themselves in New York and single, the friendship ramped way up, into multiple-phone-calls-per-day, soul-baring, belly-laughing territory.