In 2017, Patty Jenkins gave the world our first real full-fledged move all about Wonder Woman. Gal Gadot took on the titular role and her character would make her way to the world of man alongside Steve Trevor. Chris Pine took on the role of the World War 1 pilot that would fall for the Amazonian half-goddess. Sadly, their love ended in tragedy when he sacrificed himself. Yet, a misguided wish saw his return in the body of another even as she once again had to bid farewell. With a third film on the horizon, Pine was asked about a potential return in the upcoming third entry where he got a rather straight-forward.
I think poor Steve is dead, but I wish them all the best on the third one.Chris Pine
It makes sense, especially with Diana Prince making the step to finally letting go during Wonder Woman 1984. It would be step back for her character development to find a way for him to return, or even just him randomly popping up out of nowhere. Though, perhaps she gets one final goodbye in some kind of major crossover event that restarts the DCEU, or we explore a different dimension where he survived. But, Wonder Woman 3 will likely focus on closing out the story that started in 2017.
Source: USA Today