The Light We Lost by Jill Santopolo
During their senior year of college, Lucy and Gabe randomly come together on September 11, 2001, before going in separate directions. They reconnect years later and fall into a passionate love affair only to be separated again, but this time because Gabe accepts a job as a photographer with the Associated Press overseas and Lucy refuses to leave her job in New York City. Both wanting to make their mark on the world, neither wants to give up their dream for their relationship.