What is the ruling regarding a husband telling his wife: "If you do such and such again, consider yourself no longer my responsibility," while intending the word "divorced," but he is hesitant and unsure about his intention to effect a divorce immediately upon the fulfillment of the condition?

The mentioned phrase is an equivocal expression that can imply divorce or something else. Divorce does not occur through it unless there is an intention to effectuate it. If the husband doubts his intention to effectuate divorce with that equivocal expression, then no divorce results from it, because the original state is the continuation of the marriage, and it is not removed by doubt.