The phrase "went on one" typically refers to going on a date with someone. Antonyms for this phrase can include words like "didn't go on one," "stood up," or "cancelled." Alternatively, if looking for a more positive antonym, one could use the phrase "went on many," indicating that the person went on multiple dates with their partner. Other antonyms could include "single," "unattached," "unengaged," or "uncommitted." Overall, when searching for antonyms for "went on one," it is important to consider the context in which the phrase is being used and to choose words that accurately convey the intended meaning.