At this point you have to be separated from Anthony, because the option to stay with him isn't available yet. And to stay with him you can't play any of the content beyond the end of Chapter 2, without automatically deciding to finish with him.
Any future content with Anthony, where Myriam decides to stay with him, will be totally separate from everything in the game, that happens after the end of Chapter 2.
Zorlun has said there'll be no further content with Marc, till after the dates are finished. So not till early 2024.