The singer's ex Katie Lee said Joel always had "a little resentment" toward her for pushing him to seek treatment.

Billy Joel is looking back at the highs and lows of his life. In his new two-part documentary Billy Joel: And So It Goes on HBO Max, the "Uptown Girl" singer recalled getting treatment for alcohol abuse at the Betty Ford Center in 2005.

Billy Joel is opening up about a tough moment with longtime friend and tourmate Elton John. In the second part of the new two-part HBO Documentary, "Billy Joel: And So It Goes," the "New York State of Mind" singer shared how John's public comments that he needed rehab strained their friendship.