I am still having a hard time understanding what the issue is between them
Reading through previous chapters, I'm still unsure what Gojo is thinking, why he's down after the event. As for Marin, it seems that because of how Gojo is acting, she thinks she's bothering him, which lead to the decision that she should stop now, and (maybe) continue her cosplay journey with the pro agency
over all, it's frustrating that they are not communicating, especially this is long after the incident with the 1st costume. I expect that they will address and resolve this eventually, but man it's so straining to go through it when you only get 1 chapter a month or two