The 32-year-old and Lewis, 24, came to blows while filming a TOWIE special in Ibiza, after she heard rumours of his infidelity.
But, rather than apologise for his actions, Lewis took a swipe at their age difference, saying 'Who wants to date a 40-year-old anyway?"
Now Lauren has hit back. She told the Daily Star: "Cheating is never something I will accept in a relationship – neither will I accept the disgusting way he spoke to me afterwards."
It's no surprise that Lauren is upset: not only did Lewis seem unbothered by his cheating, he also confessed to not using protection with his other women.
When Lauren asked the question, he replied sarcastically: "There was a baseball bat in the room."
But Lauren has no need to mope around following the break-up as she's about to launch another fashion collection with InTheStyle.com.
She said: "I don't need a break up to push me towards success, I've worked my ass off for years and everything I have is from my own back."
And it seems Lauren has Kirk Norcross in the form of a shoulder to cry on. The former couple spent time together at the weekend, with them both uploading selfies of their chilled out Saturday evening.
The next day, Kirk even insisted he was never going to let her go again!