I think Billy Joel gets a bad rap from critics. I enjoyed a lot of his late 1970s-early 1980s material, including this song.
I don't care what you say anymore, it's my life
Go ahead with your own life, leave me alone
(Keep it to yourself, it's my life)
I don't care what you say anymore, she's my wife
Go ahead fuck your own wife, leave mine alone
(Keep it in your pants, she's my wife)
This fits Billy Joel perfectly. I mean, the guy looks average at best, and yet he was married to Christie Brinkley. Then at age 55, he married 23-year-old Katie Lee. So he's been telling guys to back off for years (of course this song came years before those relationships, but I haven't seen pictures of his first wife).