What on Earth happened? He was on vacation with Sofia Richie and his kids just days ago!

Scott Disick raised more than a few eyebrows last night at Kanye's album listening party in Wyoming, because he was flirting with chicks and telling everyone that he was "single" and ready to mingle. Did The Lord and Lionel Richie's daughter really split?

LD was acting like a man let off his leash, too! Eyewitnesses tell TMZ he had a drink in his hand the whole evening, and appeared to be wasted. For someone that's had alcohol issues in the past, this isn't good news. Is his yearlong romance really over? If so, single ladies everywhere might want to watch out!

While the father-of-three was cutting loose in the mountains with Kim and Kanye, his teen model girlfriend was at Nobu in Malibu grabbing dinner. Is it possible he didn't inform her of the change in their relationship status? Or did he, which was why she posted this pic of herself in a thong from their recent trip to St. Barths? Nothin' can make a guy regret his decision quite like some nice booty!

A post shared by Sofia Richie (@sofiarichie) on