The pair then discusses their earlier altercation and Bruce Wayne explains that the reason he was so critical of Wonder Woman is that he sees her potential as a leader of this team, something they will clearly need at some point.
When he’s not around, he wants her to take her place at the front of the Justice League.
Wonder Woman comes upon him and sees the bruising that has built up on his body over the course of the film and, one assumes, even longer.
This gets followed up on later, when we see Bruce Wayne taking a bit of a break from the rest of the team in the back half of the film.