The loved-up couple hit a rocky patch when Fran discovers saucy naked pictures of a girl Diags used to see...and she's not happy.
In sneak peek shots from tonight's show (29 October), a distraught Fran confides in Georgia Kousoulou and Lydia Bright about her discovery, telling them that she saw the photos on Diags' phone.
And it's not long before Fran bursts into tears as she continues to tell the girls about her revelation.
Meanwhile, Diags is also visibly upset and bursts into tears at the prospect of losing Fran.
With their relationship under strain, the pair later arrange to meet up and come face-to-face in a bar, but will Fran forgive and forget? And can Diags win her back?
Judging by this picture, we're not too sure, as Fran soon storms off...
Since series 11, fans have watched Fran and Diags fall in love as their friendship blossomed into romance, but after this latest discovery, can they beat the TOWIE relationship curse?
The drama continues in The Only Way Is Essex on ITVBe at 10pm on Wednesday 29th October.
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