LuAnn De Lesseps will be seen in an upcoming Watch What Happens Live interview with Andy Cohen and in a sneak peek at the upcoming episode, the Real Housewives of New York City star is seen opening up about her divorce from Tom D'Agostino.

At one point, as fans can see from the sneak peek, the longtime reality star and mother of two vividly recalls the moment she knew her seven-month marriage to D’Agostino was over.

“It was like the week before the reunion basically, and Tom went out and he called an old girlfriend and they met up with a group of people, and I didn’t know about it until I found out about it the next day in the press,” De Lesseps told Cohen during their interview, which is set to air on Wednesday, September 6 on Bravo.

“That for me was the final straw, I can’t do this anymore,” she added.

After facing allegations of infidelity in shortly after their February 2016 engagement, De Lesseps chose to ignore what people were telling her about D'Agostino and married him months later on December 31, 2016. Then, earlier this month, after rumors swirled in regard to fights and possible cheating, De Lesseps confirmed her plans for divorce with her fans and followers on Twitter.

De Lesseps also spoke of her alleged altercation with D'Agostino in July. 

“I didn’t slap him, what I did was grab his face. It was in the heat of the moment, and you know, I was hurt about something so I just wanted his attention and I grabbed his face. It wasn’t really a slap,” she explained.

To see more of LuAnn De Lesseps and her co-stars, including Ramona Singer, Bethenny Frankel, Sonja Morgan, Carole Radziwill, and Tinsley Mortimer, tune into the third part of The Real Housewives of New York City's seaon nine reunion on Wednesday night at 8 p.m. on Bravo TV.