Photo courtesy of FOX

Say it ain't so!

Matthew Morrison, who stars as the motivational teacher on Glee, is wrapped up in a possible cheating scandal, according to Star Magazine.

The actor's former fiancee Chrishell Stause tells the mag why she decided to break off their engagement: "Because I believed he was seeing other people and just wasn't ready to fully commit."

And it seems Morrison's wandering eye allegedly landed on co-star Lea Michele. Apparently, a rumor linking him and Michele is the reason Stause called off their wedding.

Damn! Think there's any truth to this? I can totally picture Lea's diva behavior having something to do with this...