When Usher gets wind of what his ex-girlfriend Rozonda "Chilli" Thomas said about him on a radio program, his "Yeah!" may become an "Oh no!"

The TLC singer appeared on The Bert Show on Atlanta's Q100 Tuesday and claimed the real reason she and Usher split up for good was that the "U Got It Bad" singer had cheated on her. "Usher did the ultimate no-no to me," Thomas told listeners during an interview. "I will never be with him again, and that is that."

Reports of the couple's on-again-off-again relationship have swirled in recent months. While promoting his new album, "Confessions," and hit single "Yeah!", Usher recently told MTV, "Yeah, I'm single," but added, "We're still friends. It's just something that happens in life."

Chilli, however, didn't seem all that friendly on Tuesday, as she told the deejays, "He portrayed himself to be this honest and great guy, and he really wasn't."

Asked whether she would ever consider getting back together with Usher, Thomas said, "I will never take him back. It is a done deal."

Regardless of how attractive other women may still find the hunky R&B singer, Chilli spared no comment: "He is so not-cute to me," she said. "I don't ever want to see him again."

Meanwhile, Usher's hit "Yeah!", featuring Lil Jon and Ludacris, moved to the No. 1 spot on the Billboard Hot 100 singles this week.

MTV reports that on "Confessions II," another track from his new album, Usher sings, "Got me talking to myself asking how am I going to tell you/ 'Bout the call I got from the girl/ That I was creepin' with, creepin' with/ Says she's three months pregnant and she's keepin' it."

"It wasn't a specific situation that happened in my life right now," he said. "In other words, I wasn't in a relationship and got another girl pregnant -- right now. But it is something I can relate to and it's something that has happened to me in the past. As I said, I have a few deep, dark ones that I've kept stowed away in a closet for a minute."