Canadian musician Alice Glass has posted a lengthy online message to fans alleging abuse at the hands of her former Crystal Castles bandmate.

Glass (whose birth name is Margaret Osborn) left the critically acclaimed electronic duo in 2014 citing "a multitude of reasons both professional and personal."

On Tuesday, she alleged on her website that her former Crystal Castles partner Ethan Kath (whose birth name is Claudio Palmieri) abused her dating back to when she was 15 and he was 25.

She alleges he was manipulative and controlling during a relationship that included non-consensual sex and physical and emotional abuse.

In an emailed statement provided by his lawyer Michael Weinsten, Kath said he was "outraged and hurt by the recent statements made by Alice about me and our prior relationship."

"Her story is pure fiction and I am consulting my lawyers as to my legal options. Fortunately, there are many witnesses who can and will confirm that I was never abusive to Alice," said Kath.

Glass says she was inspired to post the statement based on the "the many courageous women" who have recently spoken out about their experiences with being abused.

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Glass left Polaris Prize-nominated electro-rock duo Crystal Castles, pictured here in 2009, three years ago citing 'a multitude of reasons both professional and personal.' (Crystal Castles)

"Leaving Crystal Castles was the single most difficult decision I've ever made — that band was everything to me. My music, my performances and my fans were all I had in the world. I gave that up and started over not because I wanted to but because I had to," Glass wrote.

"As difficult as it was, I knew that leaving was one of the best decisions I've ever made. It has taken me years to recover from enduring almost a decade of abuse, manipulation and psychological control. I am still recovering."

Crystal Castles concerts scheduled for next month in Vancouver, Montreal and Toronto have been cancelled.