The same source also confirmed 'Scott went to Wyoming because of it and was photographed with another girl and that was the icing on the cake for her to break up with him'.
The couple, who were together for nine months, made their relationship official late last year which threw their social media followings into a kerfuffle because of the 16 year age gap. "When Scott drinks, he is a sloppy mess and fools around", adds People's source.
The reality TV star allegedly told guests he was single and no longer with Sofia, TMZ reported.
Friends of the couple revealed that the model had been a positive influence on Disick, whose party lifestyle and drinking also reportedly contributed to his split from Kardashian in 2015.More news: Tiger Woods holes out for incredible eagle at Memorial Tournament
According to the publication, her father Lionel even threatened to "cut her off" if she didn't end the relationship.
Meanwhile, another insider said that 'she could not stand for being cheated on and being in such a toxic relationship'. According to a source who spoke with Us Weekly, Richie ended things with Disick after he cheated on her.
There are various factors thought to have caused Sofia and Scot's split.
Sad news for Scott Disick and Sofia Richie fans. Sources close to Scott are saying he isn't taking any of this seriously and he thinks she [Sofia] might change her mind.