United Kingdom, June 6 -- Billy Joel attempted suicide twice in his early 20s.

The 76-year-old singer "felt like a homewrecker" after he had an affair with Elizabeth Weber while living with her, her husband Jon Small - who Billy was in a band called Attila with - and their son and when the truth emerged, the Piano Man hitmaker embarked on a downward spiral.

In new documentary Billy Joel: And So It Goes, People magazine reports Elizabeth - who later reconnected with the singer and they were married from 1973-1982 - said: "Bill and I spent a lot of time together. [It was a] slow build."

Billy confessed to Jon that he was "in love" with Elizabeth.

He added: "I felt very, very guilty about it. They had a child. I felt like a homewrecker. ...