The 61-year-old Rolling Stone confided to a friend he can't choose between his wife Jo and family and 20-year-old Ekaterina Ivanova, who he ran off with in July.
Despite his behavior, Jo - his wife of 23 years - has been visiting him in the rehab center where he is being treated for alcohol, drug and sex addiction.
A friend told Britain's The Sun newspaper: "Ronnie says he has to decide whether to go back to Jo or start a new life with Kat."
"He says he's deeply in love with Kat. He's always talking about her. He called her a sl*t, but says that's what his family call her."
"Ronnie says his daughter Leah and son Tyrone are furious with him. He's getting more support from his stepson Jamie."
While Jo has remained silent about the affair, she visited the star at the Life Works Community center in Surrey for the second day running yesterday (August 21, 2008). After telling reporters Ronnie was "fine," the couple were pictured smiling and talking happily together.
Ekaterina has repeatedly claimed she is planning to set up home with the musician once he leaves rehab.
She said: "Ronnie's moving on. It's a fresh start. He's made the decision."
"It's sad we've caused people pain. It's hurt his family and my family too, but we've just fallen in love."
Ekaterina was spotted in London club "Punk" on Wednesday night (August 20, 2008), where she was reportedly getting close to a much younger look-a-like of the aging rocker.
