Electronic dance music superstar Deadmau5 has opened up about his split from fiancee Kat Von D following allegations he cheated on the celebrity tattoo artist. Kat Von D called off her engagement to the DJ earlier this week (begs24Jun13) amid accusations the star, real name Joel Zimmerman, had been unfaithful during their relationship. In a post on Twitter.com, she wrote, "Cheating on your loved one is the most hurtful thing one could do. I hate to have to admit that this relationship is indeed over... Onwards and upwards." Now Deadmau5 has come clean about the cause of their break-up, admitting he enjoyed a fling with another woman while the couple was briefly separated last November (12) - but he insists he never tried to hide the short romance from Von D. In a post on Facebook.com, he writes, "All i am saying on the matter: Kat and I split in November and I moved back home to Toronto (Canada). During this time, while we were broken up, I did have relations with another woman. Following that, Kat and I reconciled and I acknowledged being intimate with another person while we were estranged. "We did move past those issues and I proposed to Kat in mid- December. At the end of June, it was clear that the relationship was not working and we mutually ended the engagement. I was not, at any point, unfaithful to Kat during our time together. I don't wish to go tit for tat with these kinds of pronouncements and don't expect to comment further, but I do believe that those who have expressed concern deserve a more complete understanding of what transpired." Von D was previously engaged to Sandra Bullock's cheating ex-husband Jesse James, but ended the relationship in 2011, six months after he proposed.