In what way does Nick lose all his connections when he moves out to his commuting town near New York?

Nick decided to take a house outside of the city because he had a roommate set-up, and he preffered green lawns to the city. His roommate, however, had to cancel out, leaving Nick alone, and in essence, somewhat cut off from the city.

The practical thing was to find rooms in the city, but it was a warm season, and I had just left a country of wide lawns and friendly trees, so when a young man at the office suggested that we take a house together in a commuting town, it sounded like a great idea. He found the house, a weather-beaten cardboard bungalow at eighty a month, but at the last minute the firm ordered him to Washington, and I went out to the country alone. I had a dog — at least I had him for a few days until he ran away — and an old Dodge and a Finnish woman, who made my bed and cooked breakfast and muttered Finnish wisdom to herself over the electric stove.