The radio presenter revealed her former partner had cheated on her with multiple women during their relationship and marriage on Channel Seven’s The Daily Edition on Thursday.
Greig said she has tried to keep the reasons behind their marriage break down private since she announced the split in April 2016.
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However, that hope was dashed when she caught wind of women claiming to have slept with Pollock approaching news outlets and magazines to sell their story.
“Steven and I dealt with it privately, but I didn’t want our friends and family to hear about it from someone looking for their 15 minutes of fame,” the 34-year-old told Adelaide Advertiser’s Confidential.
“Most had no idea that it had happened and ideally we would have kept it that way.
“It absolutely broke my heart but time heals all, I’ve dealt with it and moved on.”
Grieg told The Daily Edition that revealing the infidelity was not about slandering Pollock, who she wed in November 2014, but stopping other women from “selling their story”.