On last night's TOWIE episode we saw Ferne McCann suggesting the couple were having difficulties – and claiming that Mario had been checking out newcomer Chloe Lewis.
It happened after Ferne, Billie Faiers and Jessica Wright had just introduced Mario to Chloe for the first time, and they all thought he'd been giving her admiring glances.
While Mario has kept silent on Twitter, model girlfriend Emma was quick to respond, tweeting at Ferne: "No my relationship was not on the rocks, Thanks Ferne. Really nice girl you are."
Emma also retweeted a comment from TOWIE star Vas J Morgan who said: "Trying to set Chloe Lewis up with Mario Falcone who is in a serious relationship with another girl? What high morals you have Ferne McCann."
Ferne replied to Emma: "Before tweeting and going in on me please talk to your man before blaming me."
So far, Mario's kept silent… we'd love to know what he things of it all.
Mario and Emma began dating last year. Emma made a brief appearance on the series premiere of TOWIE in February but other than that has remained off camera - though, Mario himself told us that's because he wanted to keep Emma all to himself.
TOWIE airs Wednesdays and Sundays at 10pm on ITVBe.
Who has hooked up with who in TOWIE?