In February, Joss Whedon announced that he was no longer writing or directing Batgirl. The only reason he gave at the time was that he didn’t have a story. Last night at the premiere of Avengers: Infinity War, Whedon elaborated on why he decided to exit Batgirl.

“It had been a year since I had first pitched the story. A lot happened in that year and I felt some of the elements might not work as well and the story kind of just crumbled in my hands,” Whedon told Variety. “There were elements that I just hadn’t mastered that I… after a long time felt like I wasn’t going to. So, I told people that I didn’t have an idea, which isn’t exactly true. I had an idea, it just didn’t fit in the space that was left for it. It was a little heartbreaking because I was so excited about it, but I’m currently working on something of my own and there’s nothing more exciting than that.”

Since Whedon left Batgirl, Christina Hodson was brought in the write the script. We recently learned that Batgirl will be introduced in Birds of Prey before getting her own solo movie.