Samira Mighty and Frankie Foster spent a night in the hideaway in scenes unaired by Love Island.
The revelation follows Samira exiting the show in last night's episode.
She left the villa to be with Frankie, who had been eliminated earlier on this week.
In an emotional goodbye, Samira told the group: “So, these past couple of days I haven’t been myself and I’ve struggled to be happy in here and have fun and I had a taste of what I’ve wanted and it’s gone. I’ve really tried and been tossing and turning about what I’m going to do.
"I think the best thing for me to get closure on the Frankie situation and for me to be happy is to go today. I’m really sad but it’s a good thing. I’m really happy that I’m doing this and I feel really strong. I love all of you so much. You are all so amazing."
Samira's departure proved a shock for viewers, but it's since become clear that her relationship with Frankie was perhaps a lot more than we saw.
It's been revealed that the pair spent a night in the hideaway together in scenes edited out of the show.
"We did, we spent time in the Hideaway," Frankie confirmed to the Metro newspaper. "We got a text and then the other islanders picked us two, and then everyone was cheering us on as we walked in."
He didn't say what happened between them, joking: "I cannot talk about the Do Bits Society, it’s top secret, have you not heard the rules of the DBS?
"Once you get your membership card you are in DBS for life."
A spokesperson for ITV said: "We don’t necessarily show every moment in the hideaway owing to the constraints of it only being a one hour show."
Love Island 2018 airs nightly at 9PM on ITV2.