United Kingdom, June 5 -- Elizabeth Weber has "great" memories of her marriage to Billy Joel.

The 78-year-old former business manager was married to Uptown Girl singer Billy, 76, from 1973 to 1982 and has never spoken out about their marriage until now.

She told PEOPLE: "It was great then, it's great whenever I think about it, and it's great now."

Elizabeth has revisited that part of her life as part of the Billy Joel: And So It Goes documentary and admitted that it was the two-parter's executive producer Steve Cohen who persuaded her to get on board.

"I love Steve and I worked with him, and he's a close friend of mine...but I thought, 'Wait a second. I have a really nice life. I have a lot of privacy. I immediately [agreed]."

It was...