, giving us absolutely zero time to recover from missing that he was single to begin with. had the intel and revealed Zac and broke up and then he promptly moved on to Halston. And things between them are progressing pretty darn quickly, because Us said Zac and Halston “are in a serious relationship and in love.” They also spent a large chunk of time together in late 2019. “They spent the holidays together, with part of that time in Santa Barbara,” the source said.