It may seem super obvious to many of us but we've seen a fair few Essex couples break down over allegations of infidelity over the years.
Diags, however, has just celebrated his pretty much drama-free one-year anniversary with co-star girlfriend Fran Parman.
When asked by the TOWIE official website what the secret to a happy Essex relationship is, he replied: "Don't cheat! If you don't do that, you'll pretty much be alright! You can deal with the other s**t."
He then cheekily added: "Just don't do the cheating. You can't come back from that. And they always f**king find out! I'm joking. That makes me sound guilty! I would never do that!"
We saw Diags and Fran toasting their one-year anniversary on Wednesday night's (11 March), which they combined with a night out at James 'Lockie' Lock's Luxe.
On 6 March, a loved up Fran had tweeted: "A year today with my best friend @JamesBennewith happy anniversary. Love you to bits #friags."
Diags replied: "@Franparman love you too. Happy anniversary #friags."
TOWIE airs Wednesdays and Sundays on ITVBe at 10pm.
Who has hooked up with who in TOWIE?