"When my husband was sick the first time, that [saying] was the first thing that came back to me," Dion told PEOPLE about Angélil – who died Thursday from ongoing health issues – in an exclusive interview and what would be their final magazine photoshoot early last year. "I want to believe that I'm the best for him and at caring for him."
"I am scared of losing him, because it's bad," she continued. "But I have to show myself, my husband and my kids that I'm strong and we're okay."
The music manager, 73, was first diagnosed with throat cancer in 1999, and Dion, 47, retired for two years to help care for him.
In late 2013, Angélil underwent a procedure to remove a tumor from his throat. Dion postponed her Las Vegas residency, an Asia tour and other business activities to "devote every ounce of strength and energy to my husband's healing," she told PEOPLE at the time.
Posing for a shoot with her husband in March last year just before returning to the Coliseum stage, Dion opened up about how Angélil's health issues solidified their marriage.
Eric Ray Davidson / Trunk Archive
"It made us stronger," she said. "He wants me to fly. He wants me to go. But at the same time, he needs me so much, and I really want to take care of him as well. When I stopped [performing], I wanted to just be a wife and a mother."
The couple also put up a united front for their three children – René-Charles, 15, and 5-year-old twins Eddy and Nelson (Angélil has three other children from two previous marriages).
"Music is my passion. My family and my kids and my husband are my life," she said. "Sickness is tough. It's not something you choose, you know? But once you have time to have a plan, to see what's going on and understand what's going on, then you just live every day to the fullest. We don't know what the future will bring for us and how long and how far it will take us, so we decided to just get the ticket to ride and go for it."