The “loneliness” Gal Gadot alludes to could easily be, at least in part, due to that loss. Though it’s easy to imagine that being an immortal warrior goddess also makes it a little hard to hold down long-standing relationships of any kind.
Even without the new era, it will be interesting to see this new side of Diana.
In Wonder Woman, we saw only glimpses of how she handled her grief over losing Steve.
Though it seemed as though she’d found a way to move on in the present day, we didn’t get to see her journey to that point.