The 46-year-old singer revealed in the interview that René Angélil, 73, who is also her longtime manager, has to be fed via feeding tube because of his throat cancer.
“He can’t eat, so I feed him,” Dion told Roberts. “I have to feed him three times a day… I do this myself.”
Dion and Angélil have been married since 1994 and have three sons together.
“We are taking life one day at a time," Dion told Roberts. "[But] we are choosing to live."
Dion postponed her Las Vegas stage shows for a year to care for Angélil after he was diagnosed with cancer for a second time. The singer’s rep confirmed to ABC News she will return in late August.
Watch the full interview with Celine Dion, Wednesday on “Good Morning America” at 7 a.m. ET and on "Nightline" at 12:35 a.m. ET.