The phrase "broke one up" implies that something was disrupted, ended or even destroyed. Antonyms for this phrase would be "created harmony," "built up," and "united." These antonyms indicate that something positive was brought about, rather than being taken away. It could refer to a relationship, a project or a community. While "broke one up" carries a negative connotation, its antonyms convey positivity and cooperation. Therefore, in order to avoid the negative aspect of "broke one up," we should aim to "build up" and "create harmony" in our personal and professional lives.