I agree on that. I really cannot see her being happy with her entire situation. She would have been depressed for some time. To immediately move on and continue fucking fuccboi when she was the one distraught does not seem to make sense, unless as a lot of us presumed, she was not into it at all, and she was just in limbo, as we have learned so far that she seemed to only got one role.
For my prediction, we might see Shinobu holding off answering Fumi's confession and tells her to wait abit, or after their film, and it then jumps to Sakura's POV and hopefully we will get her side of the story and her state of mind. As I said before, there is no way she moved on from Shinobu and of what happened to become what we all assumed she is now (Slutkura). I don't and can't really see her initiating anything with fuccboi.