I know I'm responding to this very late, but she explicitly said that despite us separating, she still wanted to work it out with me and wouldn't see anyone else. She'd accuse me during that time of sleeping with other women (I wasn't) and kept telling me that because she wants us to work she wasn't seeing anyone either.
So no, it wasn't assumed. She did owe me monogamy because she was explicitly demanding it from me, which I kept my word.
As an American, I find it funny when I see other Americans shit on the French. Idk, when I think the French I think of the French revolution, which was bloody.
The French did not fuck around when they had to get shit done, whereas we Americans bitch and moan but never do shit because idk, it's inconvenient.