The film director had been dating the tragic Back To Black singer for two years before she was found dead in her London home in July, and said that he is still struggling to move forward.
“It’s been foggy, very foggy... very tough,” he told The Mirror. “I have started getting back to work and keeping busy, but it’s difficult.
“You start thinking about it, you get down – it brings you down. Amy had turned a corner that is the tragedy.
“I get good days and bad days. It’s like that really. You are realistic, you understand it and accept it, and then on the flipside everything seems surreal. Even talking about it is strange.”
With the inquest into the 27-year-old’s death due to get underway this week, Reg, 35, insisted that Amy no longer touched drugs and that her drinking was more or less under control.
“She had been involved with drugs long before we were together. That was way in the past. That was not a bit of her life,” he said.
“You couldn’t put her in a room with drugs - it just wasn’t her world any more. She had nothing to do with drugs, had no interest in drugs, all that was in the past.
“The drinking as well, it wasn’t any more than a lot of people her age. I know girls of 27 who work in the city and they drink more than she drank, they binge-drink three or four nights a week.
“But she had all that within her control. What happened was a reaction to the abuse she had put her body through a few years ago.
“These things take a strain and if the body gets strained it takes its toll. I believe that’s what it was and I think that the seizures she had been having were a consequence of that.”
“I remember Amy as I knew her,” he added. “Which is very different to the general public’s perception.”