Jon Cryer reveals shocking truth about his & Demi Moore's relationship during their 1980s Romance!

Jon Cryer was unaware of Demi Moore's struggle during their 1980s romance while filming "No Small Affair."

Jon Cryer revealed that he was unaware of Demi Moore's battle with drug addiction during their brief romance in the 1980s. The actor discussed their relationship, which took place while filming the 1984 movie "No Small Affair," in an interview with PEOPLE. "We dated for a short time while we were working on 'No Small Affair,' but I guess our particular affair was, in fact, pretty small,” Cryer said. “She was already struggling with a drug problem. One that I was blissfully unaware of until a couple of weeks before the movie ended.”

Moore detailed her struggles with addiction in her 2019 memoir, "Inside Out," where she mentioned entering rehab at the request of "St. Elmo’s Fire" director Joel Schumacher before filming began in 1985. According to The New York Times, she relapsed and sought treatment again in 2012 for trauma, codependency, and substance abuse.

In Andrew McCarthy’s upcoming Hulu documentary, "Brats," Moore's issues with addiction during the filming of "St. Elmo’s Fire" are further explored. PEOPLE reported that Moore recalled the rehab staff questioning her priorities during treatment. “They said, ‘What’s more important to you, the movie or your life?’ And I said, ‘The movie! What are you talking about?’ I didn’t have any value for myself,” she said.

Moore also noted that the production paid for a sober companion to be with her 24/7 during the filming of "St. Elmo’s Fire." She praised Schumacher, saying he “stuck his neck out for me” when casting her in the film, despite her lack of box-office draw at the time. “They could have just found someone else. Because it’s not like I had any box-office draw. You know, we were all just beginning. I didn’t have anything to really warrant him sticking by me,” Moore stated.

In a recent interview with Entertainment Weekly, Moore expressed regret that she and her fellow Brat Pack members couldn’t reunite for the documentary. “I had such a great time sitting down and talking with [McCarthy.] I'm sad there wasn't an opportunity where we were all sitting in a room together talking,” she said. “That's my only wish. It's something very unique to all of us that we experienced.”

"Brats" premieres June 13 on Hulu.