"The last drugs we did together was the coke in the recording studio when you filmed us. After that, she went into rehab in Arizona and came out a different woman," the Mirror quoted Doherty, as saying.
It seems Doherty knows very well that Moss does not like drugs any more and that's the reason she threw him out of her house.
He revealed that although the waifish beauty still smoked spliffs, she does not take drugs as she feared that social workers could take away her four-year-old daughter Lila Grace if she was not clean.
"Kate was determined to sort her life out and has done. She doesn't mind the odd spliff but won't go back down the route of the hard stuff. And she certainly won't let me do drugs in her house," Doherty said.
"Drugs are a big no-no for her now. All she wants is to be a good mum to her kid," he added.
On 15 September 2005, London's Daily Mirror ran front page and inside photos that showed Moss snorting several lines of cocaine at a Babyshambles recording session.
Doherty admitted that Moss tried to work on their relationship but his drug problems ultimately destroyed their relationship.
"She was driven and tried to help me out. Her dream was for us to be a normal, happy couple like any other," he said.
"I guess my drug problem has destroyed that. You don't know how much you've lost until it's gone. I've been a bit of a idiot," he added.
The 28-year-old rocker insisted that it was hard time he sorted himself out and leave Moss alone.
"She could do without the foolhardy junkies around her, doing rash things and endangering everything she's worked hard to get. So I've got a bit to think about and need to sort myself out," he said.