Co-written and first recorded by Carole Bayer Sager (1977).
Also recorded by Peter Allen, co-writer (1979).
Hit version by Rita Coolidge (US #38/MOR #3/C&W #32 1979).
From the wiki: “I’d Rather Leave While I’m In Love” is a song co-written by Peter Allen (‘Don’t Cry Out Loud‘) and Carol Bayer-Sager, popularized by Rita Coolidge in 1979, was first recorded by Bayer-Sager in 1977. Co-writer Allen recorded his own version of ‘I’d Rather Leave While I’m In Love’ for his album I Could Have Been a Sailor. The song about breaking up was sung originally by its two songwriters, who both had married and later split up with famous spouses: Allen, from Liza Minnelli; Bayer Sager, from producer Andrew Sager.”
Peter Allen, “I’d Rather Leave While I’m in Love” (1979):
Rita Coolidge, “I’d Rather Leave While I’m in Love” (1979):