Tamra Barney opened up about her heartbreaking custody battle during last night's Real Housewives of Orange County season 10 reunion.

Vicki Gunvalson Claims Tamra Barney Was First To Expose David Beador's Affair & Mistress' Identity

While chatting with host Andy Cohen, Barney revealed she hadn't seen her daughter since the child moved in with her ex-husband, Simon.

“My oldest daughter Sidney was at her dad’s and she told me ‘I don’t want to live with you anymore. You ruined my dad’s life,’" Barney recalled during last night's show, via a Radar Online recap on Tuesday. "And for her to come and say that, I have no idea where that came from.” “She left that day and two years later, she hasn’t come back. She never talked to me again.”

'RHOC' Star Tamra Barney Has Responded To Vicki Gunvalson's Claims Of Her Possibly Fake Cervical Cancer

“I fought so hard to get her help. To go to court, to get therapy. The whole family is so separated. When your child turns their back on you, it’s humiliating,” Barney continued through tears.

“When Simon sees this I’m assuming you will hear about it,” Cohen points out.

“I don’t care,” she responds.

For more Tamra Barney, tune into the second half of the three-part Real Housewives of Orange County reunion special, airing next Monday night, Oct. 26, at 9 p.m., and check out a sneak peek of the new episode below.