The star was criticised over a commercial for the fast food chain which was pulled after it was deemed racist.
Watch the advert below:
She told US radio station Hot.97: "I thought it would have been a great branding opportunity. It never was a chicken commercial, it was about a sandwich, and I was singing about the ingredients in the sandwich. That's what I thought it was.
"It broke my heart. I understand the laughter and the jokes...you're supposed to do that when something like that happens. The thing that hurt me was when people started saying vicious negative things that had nothing to do with it."
She continued: "So many people reached out to me, [they] saw how it went terribly wrong. My brother Busta Rhymes who I love to pieces, he reached out to me. It was a mistake, you know. I didn't think it would come out like that.
"I want to apologise to anyone who was offended or thought I would do something that was so disrespectful to our culture, so forgive me if I hurt you."
Mary J Blige currently stars in the musical movie Rock of Ages, where she plays the owner of a strip club.
Watch Mary J Blige discuss Rock of Ages with Digital Spy below: