The former TOWIE star is one of thirteen housemates in this year's 'Eye Of The Storm' themed series.
Dan hit the headlines in 2015 over allegations made by his ex - including tape recordings - about their relationship.
Before entering the show, Dan said: "It’s no secret that I’ve been through a storm in the media – the recordings of an argument that I had in a previous relationship, but if anything it’s made me a better person now.”
In tonight's show, Dan opened up to Sally about the media frenzy.
He recalled: "My ex who I had my little boy with, our relationship was just like a toxic relationship, we were young.
"It was a horrible relationship. We pushed each others buttons and stuff. And I got angry just like everyone does and just said stupid things. And I was being recorded. And it went into The Sun and absolutely everywhere.
"I mean I said stupid things. I take full responsibility for it. And you learn from your mistakes. I was young and you say things when you're angry."
Dan continued: "Obviously I never meant one word of it and it's horrible, it's embarrassing now even. I hate it. I hate the fact I even done that. If I could turn the clock back I would."
He explained how the tapes and fallout led to him getting sacked from The Only Way Is Essex.
"I got sacked, I lost that job straight away and it was just gone," he explained.
Dan also discussed the following court battle to see his son.
"I was in a bad, bad place back then. Really bad. Depression and everything," the reality star added.
Celebrity Big Brother 2018 airs nightly on Channel 5.
Tonight's highlights air at 10PM.