"At this point, it doesn't really matter [whether he cheated or not]," Stanton explained.
Her then-boyfriend denied any involvement with the unnamed woman and insisted that he did not attend the concert.
Rousey, 28, was perhaps the closest of anyone to date a fellow UFC champion.
She's linked to UFC star Travis Browne, a legitimate top 15 heavyweight contender.
She went on to claim that she is now friendly with her ex-boyfriend after they have called it quits.
Robby Hayes, on the other hand, refused to comment on his alleged cheating that led to their breakup.