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The pair - who play Aimee Gibbs and Adam Groff in the Netflix hit show - were dating during filming for the first two series, and their characters were also briefly an item onscreen.
They broke up last year.
In an interview with Grazia, Aimee explained: "We'd had some time apart and then we realised that maybe the relationship wasn't serving us both.
"We still really love each other and respect each other. It was an okay breakup, it wasn't dramatic.
"I felt like a dam burst, then all of a sudden I was hurting, but I needed to be there, because I'd become a bit numb and it was nice to suddenly feel everything again."
She went on to say: "I find it hard when I'm in relationships to maintain my sense of who I am.
"I'm very independent, but I'm also quite impressionable.
"I can be taken away from myself quite easily, I kind of start betraying myself and compromising my integrity, to keep someone else happy.
"That's why it's really important for me to have time alone."
The trailer for Sex Education season three dropped last week (7 September) and fans are looking forward to returning to Moordale High.
You may remember that the last season of Sex Education left fans on a pretty huge cliffhanger after Otis finally declared his love for Maeve - only to have the voicemail deleted by newcomer Isaac.
His sex therapist mum Jean fell pregnant, Jackson and Viv made up and reaffirmed their friendship and Maeve found out her mum is using drugs again and reported her to child services, while Adam got on stage during a theatre production and told Eric how he feels - in turn, breaking Rahim's heart.
A synopsis from Netflix for the new series says: "It's a new year, Otis is having casual sex, Eric and Adam are official, and Jean has a baby on the way.
"Meanwhile, new headteacher Hope (played by Jemima Kirke) tries to return Moordale to a pillar of excellence, Aimee discovers feminism, Jackson gets a crush and a lost voicemail still looms.
"Prepare for commitment animals, alien phenomena, vulva cupcakes and much more of Madam Groff."
Sex Education season three will be available on Netflix from 17 September.
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