If Zack Snyder had been able to continue his plans for the DCEU with a second “Justice League” film, he explains that he would have explored the idea of a romance between Lois Lane and Bruce Wayne.
In an interview with Pizza Film School (around 1 hour, 41 minutes into the video), Snyder says, “I think in the original script, Lois and Batman got together briefly. There was like this whole other thing that everyone was like, ‘Oh my god, you can’t do that.’ Superman’s dead. We had written it, especially since I had Amy [Adams] and Amy’s, like, a genius, I really felt like we should lean on Amy, because she’s just a great actress, and I think like a force of nature. I loved the idea of setting up this sort of concept, it’s sort of like when you’re in a movie where the husband goes off to war and he’s dead and the wife moves on and then the husband appears, like, ‘I’m not dead. I’m fine.’ How do you deal with that? I was super into that concept, that ‘oh no, Superman can be brought back to life.'”
In a 2021 interview with Vanity Fair, Snyder explained that with Superman having died at the end of “Batman v Superman: Dawn of Justice,” he had toyed with the concept… but Warner Bros. nixed the idea.
“The intention was that Bruce fell in love with Lois and then realized that the only way to save the world was to bring Superman back to life,” Snyder said. “So he had this insane conflict, because Lois, of course, was still in love with Superman. We had this beautiful speech where [Bruce] said to Alfred: ‘I never had a life outside the cave. I never imagined a world for me beyond this. But this woman makes me think that if I can get this group of gods together, then my job is done. I can quit. I can stop.’ And of course, that doesn’t work out for him.”
I wouldn’t have been unilaterally opposed to the idea, but I would have had little confidence in Snyder to handle it well. Didn’t like how he had Superman intimidate soldiers almost like Frank Miller’s version of Batman.