She broke down in tears as she appeared on This Morning today after revealing she is taking a long break from Loose Women following her row with Kim Woodburn.
The 53-year-old admitted it has been the "worst week of her life" after being targeted by cruel trolls who told her to "die like her sister".
Her emotional appearance came after 23,000 people signed a petition to sack her following the argument.
Weeping as she chatted to Holly Willoughby and Phillip Schofield, she said: "Honestly I don’t know what to say.
"If I could go back in time I would change the whole thing because it was never meant to be like that. I honestly, genuinely thought that it was… she was coming on to make amends, that’s what I was told that was going to happen. And then we were going to have a laugh about it and make amends.
"So it was like, let’s put it to bed, let’s have a laugh about it, let’s make amends. And it didn’t go that way, obviously, from the moment she came out.
"And I have to say, it was so shocking, genuinely shocking, for all of us. None of us wanted that. I don’t like to see anybody in that much distress, how she was in the end. And it was just one of those things. It’s been the worst week of my life, actually. I’m so sorry."
Coleen went on to reveal that she has been the subject of shocking online abuse following the row, some of which involved her late sister Bernie.
Crying her eyes out, she continued: "I’m so sorry. I didn’t think I was going to cry.
"It’s just that, I don’t know what I did wrong. I didn’t say anything. I said about two things in that interview because I know what she’s like and I just thought, she needs help really. And I feel terribly sorry for her. So I’m not going to say anything.
"Sometimes it’s hard because I’ve never called her names or anything and she’s called me every name under the sun – in print and on that show. And that’s fine, I can deal with that. But to be called a bully and then to have messages going, ‘Why can’t you die like your sister?’ ‘Why can’t you get cancer like your sister?’ I’ve had a week of it.
"And in 50-odd years of doing a job I absolutely love, really love, and it’s all I know how to do, now there’s a campaign to get me fired. And they talk about me being a bully or a horrible bully and then they send me these revolting, revolting things.
"And to the point where I phoned my management and said to my kids, I cancelled everything last week after it and I said, ‘I don’t want to do it anymore.’"
She added: "I would never wish harm on Kim. I don’t hate Kim. We’ll never be friends and that’s fine. But I would never set out to bully her. Do I react sometimes to being called everything she calls me? Yes. And sometimes I laugh because I think she’s got a point. But it’s just been a really hard week. Oh God I'm so sorry, I feel like such an idiot."
Meanwhile the singer confirmed she's stepping away from the series to concentrate on her solo singing tour.
The shows kick off in January, and the schedule make it "impossible" for her to keep up with her Loose Women duties.
She told Woman's Own: "Obviously, I'll have to take a break from Loose Women.
"I can't be a regular on it because I will be in Scotland, Wales, way down south, it will be impossible to be on the show two or three times a week."
But Coleen hopes to keep in touch with her pals on the panel and possibly make guest appearances via video link while she's away.
She added: "Hopefully I can pop back when I'm near enough, or when we can do live link-ups..."
During the tour, Coleen will be playing shows around the country as a solo act.
It will be the first time Coleen has sung in public for a decade after last hitting the road with her sisters Bernie, Linda and Maureen in 2009.