The Bachelorette started filming in March of 2018, almost exactly a year after they broke up. (Underwood revealed in August of 2017 that they'd broken up, but they presumably split some time before then.) Seeing as Underwood said he's only been in one relationship, all signs point to, well, him talking about Raisman on The Bachelorette. And now we know who dumped who — Raisman broke up with Underwood, who, per his own explanation, said "I love you" at the very beginning of the relationship.