Earlier this week, Bush frontman Rossdale admitted to having a gay relationship with '80s popstar Marilyn when he was a teenager.
"I am pleased that Gavin is finally able to be honest about our relationship," Marilyn - real name Peter Robinson - told In Touch magazine. "I just wish he could have come to terms with this 15 years ago.
"I find it sad that when I spoke about what we had, I was labelled a tattletale and now Gavin is using it to promote himself."
He added that he now hopes Rossdale's wife Gwen Stefani will also accept what happened. "Maybe one day Gwen will allow my name to be spoken again in her home without it having any negative connotations."