For practical purposes, as per the title of this thread, it seems like an exercise in futility to discern whether an ‘unbreakable’ promise is, in fact, ‘unbreakable.’
I suppose, in the context you state, since you believe it wholeheartedly, and intend to stick to it, it’s unbreakable. I also suppose that an AVRT exponent would assert that the aforementioned conversation is, at least in part, the lexicon of the AV.