The star, who plays Cindy Cunningham in the soap, fell out with Kym over rumours that she was seeing Stephanie's ex, Dan Hooper.
Despite Marsh denying that she was seeing the actor, Hooper later uploaded a picture of him and Marsh in a passionate embrace whilst on a night out.
Hitting back at the pair, Waring wrote a post entitled 'in response to some of the recent press' on her Twitter, lifting the lid on her true feelings behind the revelations.
'I had to endure finding out that the father of my child had moved onto someone else, someone I considered to be a friend, only six weeks after we had separated,' she wrote.
'This new dalliance was then flaunted through online social media sites which was hurtful and humiliating.'
Stephanie added that she had never once said Marsh has 'stolen' her man, but was understandably upset by the set of circumstances.
Concluding, Stephanie wrote: 'I'm trying to move forward for my daughters' sake. As a single mum, all I can do is focus on my family and work hard.'
'This is the last thing I will ever say on this matter anything else published in the press will not have come from me.'
While Stephanie claims she and Kym Marsh used to be friends, sources close to the pair have since said that this couldn't be further from the truth.
They exclusively told us:"They've only met four times in their life… it serves Stephanie's purpose to pretend otherwise."
Waring and Hooper dated for almost a decade with Dan Hooper, and the couple welcomed a daughter, Lexi Grace, in 2010.