Sofia Richie has broken up with Scott Disick due to cheating and other "toxic" behavior, reports E! News. The two split on Friday, one day after Kanye West's Wyoming listening party where Disick was spotted flirting with another woman. He is also reported to have cheated on Richie in Miami, according to Us Weekly.

"Sofia broke up with Scott after the pictures and rumors of his behavior in Wyoming were floating around," says a Source from E!. "She couldn't take it anymore. Scott has been off the rails recently and is not in a good place. He goes in waves of partying really hard and then will have his good days and it's just very toxic behavior. It's very up and down." The same source believes the two will eventually work things out.

Last month, Richie reportedly inked a deal to appear on Keeping Up With The Kardashians. It is unclear if the appearance will still take place.

When the two were first rumored to be dating last October, Sofia's father, Lionel Richie, expressed his opposition to his 19-year-old daughter dating the then-34-year-old Disick. "Have I been in shock?! I'm the dad, come on," he said. "I’m scared to death, are you kidding me?"