Tyler James gave insight into the reality of Amy Winehouse's life. (Courtesy)

Amy Winehouse's best friend has opened up about the singer's struggles with drugs as it approaches the ten-year anniversary of her death.

Tyler James wrote a piece for The Mail On Sunday, where he spoke about the singer's regrets, a failed rehab attempt in 2007 and her relationship with Blake Fielder-Civil.

The Back to Black crooner had smuggled drugs onto Mustique island, as she stayed with Tyler as guests of Bryan Adams.

When the drugs had run out, Tyler said that she withdrew and "had been heavily sedated by a local doctor".

Mick Jagger offered him comfort, saying: "Don’t worry, man, she’ll be all right. People in that world go through this sort of thing."

The world famous singer told him that Amy was a "rock star" and that what she was going through was "normal", claiming addiction was "part of the process".

Tyler had been friends with Amy since the pair were in their early teens, saying that towards the end of 2004 was when the star started to "lose the plot".

Amy Winehouse. (Courtesy)

They shared a flat in Camden, London, and Amy had started to show the signs of obsessive compulsive disorder.

It was alcohol, which would later take her life, that she first grew addicted to.

Tyler said that she suggested they "go to the pub and play pool" every day at around 11am.

He said that she would drink a shot of black sambuca every 20 minutes, with the daytime drinking leading to her meeting people "who do hardcore drugs".

Tyler said that it was her time drinking in pubs that led her to meeting her future husband Blake Fielder-Civil one night when he hadn't accompanied her.

The Worry About You singer said that Amy had sat in the bath, telling him the relationship would never work due to Blake's addiction to heroin.

Despite her initial concerns, the two would go on to get married when they were "high as kites on drugs and booze".

Tyler revealed that it was Blake that first offered Amy heroin, with her later telling him "if that’s the thing that’s stopping me from being with him, then I’m going to do it."

Her addiction got steadily worse, after Blake went to jail Amy had went to Mustique with Tyler in hopes of a recovery.

Amy's best friend admitted that she "wasn’t ready for help" and she had insisted on returning home to see Blake.

Her addiction to heroin caused her to miss out on amazing opportunities for her career, she had been asked to write and record the theme for the James Bond film, Quantum Of Solace.

Mark Ronson was initially patient, but after Tyler told him he has "heroin needle in the bathroom", the opportunity was cancelled.

Tyler said that Amy confessed to spending half a million pound on drugs, telling him: "I spent about 500 grand on drugs, it’s a mug’s game. I could’ve bought a house. I could’ve bought you a house."