Oliver is trying very hard not to "manage" his learning of French, instead learning organically. Julien is watching to see if Oliver can accomplish his non-managing. Learning French has become their metaphor, as @Charles26 wrote. Their rift is not about Oliver making a mistake, apologizing, and that apology not being accepted by Julien. Julien is trying to see if Oliver can change the way he thinks and behaves. Oliver realizes this and is trying hard not to automatically think, plan, research, weigh all the alternatives, judge, plan again, etc. Oliver is doing this for himself, necessarily by himself.