The O.C.-based plastic surgeon -- who went from being Kelly Dodd's doctor to being her boyfriend around November of last year -- wanted to make sure his message was heard loud and clear while standing outside Craig's in Los Angeles over the weekend.
When asked point-blank if he had been unfaithful to the 43-year-old reality star during their relationship -- which ended for good earlier this month -- Dr. Brian let out a chuckle and said, "I definitely did not cheat. Absolutely not."
"I heard she's moved on," he added. "I'm very happy for her."
Reaching for the door of the restaurant, the plastic surgeon was given one more opportunity. "And you didn't cheat?" the cameraman asked again.
"Absolutely not," Dr. Brian reiterated. But that's not what Kelly believes.
This is now the second time the plastic surgeon is publicly denying cheating on the "RHOC" star. A little less than two weeks ago -- after Kelly announced on Instagram that she and Dr. Brian had broken up -- he told Page Six, "Kelly and I are no longer dating. I completely deny having cheated on her. Completely. That's not why we're not dating."
"I simply cannot make her see -- I'm not there all the time -- she's reacting. There are other things that have happened. I'm not going to share. And that's it," he continued.
"My focus is on my son and my career," he added. "I regret ever getting involved in [reality TV] ... but this is my life and I'm just gonna get back to being a good dad, a good surgeon."
Kelly and Dr. Brian were first linked romantically in November, but fans of the show met him on the Season 14 premiere. At the time, they had been dating for only three months, but Kelly maintained she was "in love." Dr. Brian even called her into his office to give her a pair of rose-gold, rain-drop diamond earrings.
To his face, Kelly was grateful and put the earrings on right away. But in her confessional, she was grateful it wasn't a ring "because that's not the way I wanna be proposed to. I would probably say no in a small office like this."
After a brief split in July, the twosome reconciled, but things appear to be over for good.
"The Real Housewives of Orange County" airs Tuesdays at 9 p.m. on Bravo.