We had proposed and accepted a rule 1: If your spouse contacts you and initiates a pleasant conversation, this does not restart your self-imposed regimen of going dark.
I'd also like to propose a rule 2 for those of us with shared pets and kids: Initiating a call to spouse for the sole purpose of scheduling, etc, for kids or pets also does not restart your regimen.
Of course, this is an honor system, so rules are arbitrary!