Taylor Swift, Joe Jonas, and Camilla Belle
Soon after Joe Jonas' breakup with Taylor Swift, the singer was seen in public with Camilla Belle on his arm. Swift then revealed that Belle was the reason for their breakup in the first place. When Swift found out that the couple went public, she said, "They’ve been together for months. That's why we broke up."
Kourtney Kardashian, Scott Disick, and Sofia Richie
Although Kourtney Kardashian and Scott Disick haven't been together for years, they share three children together, meaning that Scott is still very much in the picture. On an episode of KUWTK, it was revealed that the exes had been going to co-parenting therapy together. In the same episode, Kourt chewed out Scott after he introduced his girlfriend, Sofia Richie, to the kids without warning. However, Scott and Sofia ended up calling it quits—allegedly because Scott's priorities were still Kourt and his kids.