According to the extremely reliable sources over at PEOPLE, Richie dumped the father of three because of his "old issues".
It was reported at the time that Scott had told other guests that he and Sofia were no longer together.
The couple first sparked dating rumours when they were spotted cuddling up aboard a yacht in the south of France during the Cannes Film Festival in May a year ago. Scott has been off the rails recently and is not in a good place.
Meanwhile, another insider said that 'she could not stand for being cheated on and being in such a toxic relationship'. "He cheated on her in Miami and she found out and told [her father] Lionel [Richie]", the source says.
Sources exclusively reveal to TMZ that he was rarely seen without an alcoholic beverage of some sort in hand, and was overheard telling those in attendance that he was single.
Neither Sofia Richie or Scott Disick have released a statement about their breakup, and while pictures of Disick remain undeleted from Richie's social media pages, Scott Disick seems to have wiped any evidence of Sofia Richie from his Instagram. Sources close to Scott are saying he isn't taking any of this seriously and he thinks she [Sofia] might change her mind.