The "Mandy" singer elaborated on keeping his private life private during his interview with ET.
"This is my life, we've been together for all these years," Manilow, who was previously married to Susan Deixler from 1964 to 1965, said. "Everybody knows that we're a team. Everybody that I know knows. So it never really dawned on me to say anything about it. I mean, I'm a very private guy."