Even though the movie has been released and put on DVD by now, it was still a question why the director of the previous movie, Matthew Vaughn, didn't come back to latest X-Men movie. Now the director breaks his silence and tells what the process of leaving was.

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In an interview last week with IGN, Vaughn talked about coming up with the idea for his next movie, Kingsman: The Secret Service, and why he chose to do that over coming back to X-Men for Days of Future Past.

"It started in a pub with Mark, and we were drunk. We sort of were complaining about how spy movies had become really quite serious. We said, 'Let's do a fun [one].' ... Mark went off and wrote a version, and I read it. I was like, 'F--k, maybe we should do this for real,'" he said.

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"Then he went ahead, finished the comic off. Then I was working on Days of Future Past, and I'd finished the treatment. Then the [Kingsman] script fell out of me -- just one of those things. I remember Fox going, 'What are you talking about?' because the two scripts came in at the same time."

He went on to say that he was hesitant to give up on X-Men to go to this original movie, but knew deep down that it was what he wanted to do more.

"I was like, 'Aw, s--t.' It was a really tough decision whether to do Days of Future Past or do this. But then I was like, 'F#@k, somebody else is going to wake up and do a fun spy movie. Then I will have written a bloody screenplay that no one will want to make,'" he said.

"So I probably made the craziest decision of my life to turn down an $800 million gorilla to do Kingsman. But Kingsman's more me anyway."

Bryan Singer took over for Vaughn and helped make Days of Future Past one of the more successful blockbusters of the year, and in the franchise, and is set to return for X-Men: Apocalypse in 2016.

Tags: X-Men Apocalypse Movies Matthew Vaughn Kingsman: The Secret Service