I feel like the crowd growing, which forces him further and further away, is a metaphor for how he’s feeling she’s going to slip away. Like she’s going to a place that he can’t follow and doesn’t belong. I think he’s going to leave and she’ll chase after him.
I would go a bit further, their cosplaying relationship was going as good as their own private relationship, but now a very big wedge got in between that could break them apart. Fame.
Gojo might need to accept that he makes her that awesome looking because of skill and Marin is so much more awesome because of his skill.
Gojo is “Haniel’s devil”, and she doesnt give two fucks about the public being mesmerized, she cares about being Haniel FOR “her devil”, she is pondering how good her cosplay is while thinking about him. The cosplay’s backstory is indeed reflecting in their RL of the character completely at that point.
Two things would make sense here, depending on the perspective:
1) Gojo walks away from there asap, being overwhelmed by the dark feelings he has/Marin gets a bit overwhelmed and wants to rest, and notices that Gojo is gone.
2) Gojo stays but he is completely bitter and behaves like a hurt bitch towards her.
I really hope the second doesnt happen xD.