"We were both still seeing other people, keeping ourselves safe from getting hurt, from really putting ourselves out there,” Timberlake said in his memoir. “It took a bit for both of us to admit to ourselves that were were really, really that into each other. When I came back from tour, we spent a month together. After that, I said, 'I really want to be exclusive.' And, somehow, she said, 'So do I.'"