Long before Fantastic Beasts brought Dumbledore and Grindelwald complicated relationship to the big screen we knew they had history.

JK Rowling had confirmed Dumbledore was gay awhile back after the final Harry Potter book had been released.

Now she's finally settled a long-standing debate over what sort of relationship the pair had before Grindelwald went full dark wizard on us.

"Their relationship was incredibly intense," she said in the Distinctly Dumbledore feature on the Fantastic Beasts: The Crimes of Grindelwald Blu-Ray.

"It was passionate, and it was a love relationship. But as happens in any relationship, gay or straight or whatever label we want to put on it, one never knows really what the other person is feeling. You can't know, you can believe you know.

"So I'm less interested in the sexual side – though I believe there is a sexual dimension to this relationship – than I am in the sense of the emotions they felt for each other, which ultimately is the most fascinating thing about all human relationships."

So there you have it, while Rowling had said Dumbledore was in love with Grindelwald before she hadn't spoken out on whether Grindelwald had requited those feelings or how that pannedout.

In the movie the relationship has only been hinted at so far, with no real fleshing out of their past.

Fantastic Beasts: The Crimes of Grindelwald is out now as a digital download and will be released on 4k, Blu-Ray, 3D and DVD on March 18.