'RHONY' Star Luann De Lesseps Reveals Reasons Why Marriage to Tom D'Agostino Is Over

A major storyline on this past season of the Bravo series was Luann's tumultuous relationship with Tom, whom she married on Dec. 31, 2016, despite staunch warning from her cast mates and an infidelity hiccup on his end. Luann announced the divorce via Twitter last month prior to the Season 10 reunion airing, yet she wore her wedding dress when they filmed and made no mention of the split.

Andy Cohen went to the Countess' Sag Harbor home to get to the bottom of things and find out why she defended a now-indefensible soon-to-be ex-husband.

"I don't think that he could really give up his bachelor life to lead a married life the way I wanted to," Luann told Andy on Wednesday during their interview.

"We were married, we were a couple. You defend somebody that you care for," she said. "I can't defend his actions on the show. Believe me, those were hurtful when I saw them because I hadn't seen them. I saw what he was saying as I was on one side of the party saying how happy and great everything was as he was talking like that to the other women, so I didn't really see that happening. So during filming, I was happy, so I felt like he needed to be defended."

Luann said she believes Tom married her because he really loved her and still does, but that "at this age, it's very hard to change people."

"He was not gonna change his lifestyle, and it was a problem for me," she said, adding that she believes Tom was faithful to her for the duration of their seven-month marriage.

"For someone who is concerned with her image and the way things come off," Andy asked, "are you mad at him? Do you feel that he embarrassed you at all?"

Luann admitted that she was "definitely hurt" and that the last thing she wanted to hear from the other women was "I told you so."

"I wish I would've listened," she said.

Bethenny Frankel was among the most vocal of all the housewives when it came to Luann's relationship, but she was also one of the first to reach out to the Countess after hearing of the split. Ramona Singer and Sonja Morgan also reached out to Luann, as did her close friend and bridesmaid, Dorinda Medley. The only housewife Luann didn't hear from was Carole Radziwill.

When Andy asked Luann if Tom was 100 percent to blame for the end of the marriage, Luann said, "You can't blame somebody 100 percent. It takes two to tango, and it was a bad situation that was not gonna get any better."