The reality star, 28, namechecked Lillie, 25, in his latest Daily Star column when listing things he'd been liking in the past week.
"Liking that me and Lillie Lexie Gregg are on good terms," he wrote.
"She's a great girl."
Gaz and Lillie split in November after dating for more than a year, but their relationship is about to be thrust into the headlines again thanks to Ex On The Beach 5.
The reality show kicked off on MTV two weeks ago with Gaz and other famous former islanders arriving at the villa in Thailand. Lillie has been lined up to appear later in the series as Gaz's ex.
Gaz previously told Daily Star that it was "emotional" coming face to face with Lillie again, adding: "I had a big cry. But after it, I felt so much better. It was all closure, letting it out."
He's also said clearing the air with Lillie was his main motivation for doing EOTB, saying: "It will be nice to see her again, actually get closure and move on to the next chapter in our lives."
After their split in November, Gaz went on to romance his on-off girlfriend Charlotte Crosby, but that relationship ended a few months later. Lillie, meanwhile, dated EOTB co-star Stephen Bear for around two months but he dumped her on Celebrity Big Brother, which she branded "embarrassing and humiliating."
Meanwhile, Gaz also spoke about *that* threesome we caught a glimpse of at the end of episode two, when he and Charlotte Dawson disappeared to the penthouse with Olivia Walsh.
Or, not threesome as the case may be…
Gaz wrote in his column: "[I'm liking] that Ex On The Beach is smashing up MTV every Tuesday, it's amazing this series. But sorry folks, I did not have a threesome, just some clever camera work. I have the most exes of any series ever of EOTB, girls are just sucking my d*** now and claiming to be an ex."
He's been backed up by Charlotte and Olivia who have both dismissed the threesome claim.
Ex On The Beach continues 10pm on Tuesday on MTV.