The couple has had numerous messy breakups over the years, but this one is probably one of the least messy. Before Miley was spotted out with Kaitlynn, it appeared that the couple had been separated for months, taking time for themselves while they figured out where they wanted their relationship to go. 

But it was apparently Miley's open fling with Kaitlynn that sealed the fact that their relationship was over. Even though the pair were technically separated, Radar Online reported that seeing the photos of Miley's vacation was what made Liam decide that it wouldn't work out. "So, for Liam, that was the final nail in the coffin,” a source told Radar Online.