Ferne addressed the situation with Charlie during last night's episode of the ITVBe reality show, saying the pair are on "a break".
Ferne explained they split following a series of rows, but later admitted her shock that she was publicly "dumped on Twitter".
Speaking to Mario Falcone in last night's episode, Ferne said: "One small thing can bring up a whole load of problems and I guess for a while there has been underlying problems with me and Charlie, and it's resulted to loads of s**t and basically we're on a break.
"I know it sounds ridiculous but he thought I was meddling in between your and Emma's relationship by introducing you to Chloe Lewis."
Later on at the St. Patrick's Day party, Ferne opened up to Gemma Collins and Danielle Armstrong, where she revealed her heartbreak and hinted at a possible reconciliation.
"I'm in shock," she admitted. "I'm in shock at how you can go to bed one night in a happy relationship and everything be fine, and the next minute all it takes is one small row and then you're not together. Maybe there were a lot more problems than I thought."
Ferne continued: "I'm just taking a step back and I just need to do things for myself. I can't sit here and say I'm officially single."
Danielle interrupted, saying Charlie was the one who ended their on-off five-year-romance via Twitter.
Ferne replied: "Very true, very true. I got dumped on Twitter. I know [it was harsh] and he hasn't even apologised. I'm literally trying to put it to the back of my head."
Last week, Charlie announced his decision to quit TOWIE while also hitting out at Ferne and his sister Chloe Sims, who he has been estranged from in recent weeks.
Charlie said: "I wish @Chloe_Sims and @fernemccann the best with their lives, but always live knowing you chose the show.
"And finally to the @OnlyWayIsEssex... I won't be taking part anymore. It's time to grow up and move on. Wish everyone the best on the show!"
TOWIE bosses confirmed Charlie's departure, saying that he "hasn't felt comfortable sharing his real life on camera".
It later emerged that Charlie had split with Ferne after giving her an ultimatum. A source told Reveal: "Unfortunately Charlie has given Ferne an ultimatum – it's him or the show. This came as a huge shock to Ferne who is really upset that he would put her in such a position."
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Missed the last series of TOWIE? Recap here: