What event sparks the end of the author's relationship with Amaia as noted in the memoir, Abandon Me?

The author makes her home in New York City as an adult. Late in her relationship with Amaia, the latter agrees to move to New York to be with the author, but she finds it uncomfortable. When Amaia suggests they move together to a home in the country, the author realizes she loves the city too much to leave. It is a transformational moment in their relationship, one that eventually results in its ending.