What phrase fits this sentence: I promised him that the situation would not be repeated in the future?

The phrase "I gave my word that there would be no repetition of the situation in the future" aligns perfectly with the context of the sentence. It conveys a strong sense of commitment and reliability, suggesting that the speaker made a serious promise. This option captures the intention behind the original statement of reassuring someone about preventing a recurrence of an issue.

The phrase uses "gave my word," which is a common expression that signifies a promise or assurance. This indicates a personal commitment, which mirrors the original sentiment of a promise being made. In contrast to the other choices, this one conveys a straightforward promise rather than any ambiguity or different emotional contexts.

While the other phrases capture different aspects of communication, they do not convey the same level of certainty and commitment associated with a promise. For example, "I assured him" suggests reassurance but lacks the personal stake implied in giving one's word.