Lauren Richardson was pictured holding hands with the engaged singer in Thailand two months ago.
When the photos surfaced, Zayn flew home to be with his fiancée, Perrie Edwards of Little Mix, before announcing he was leaving One Direction.
Now Lauren, 26, is expected to tell all during her time on the ITV reality show.
Zayn took to Twitter to defend himself after photos of him with his arm draped around Lauren’s waist went viral in March.
The singer declared his love for fiancee Perrie Edwards, adding of the pics: “I’m sorry for what it looks like.”
Zayn denied the pair had a fling, but Lauren, who has been on the receiving end of abuse from angry 1D fans ever since, has never spoken publicly about what happened at Seduction nightclub in Phuket.
A source told The Mirror: “Lauren sees Love Island as a great opportunity for people to see the real her. She has kept a low profile since the stories ran about her and Zayn, and there are a lot of untruths that she wants corrected.”
They added: “She never asked for the attention but now wants something positive to come from the situation.
“She is looking forward to getting to Majorca and, hopefully, finding love in the process.”
The first episode of the series will air on ITV on Sunday 7 June.