Real Housewives of Miami's Adriana De Moura revealed details about the feud with her former friend Lea Black, which takes center stage in season 3 of the show.

"What happened with Lea is the biggest disappointment of my life. She was someone who I thought was my best friend, who really had my back and would always be there for me. This season, she's using something from my past against me as if I'm a criminal," the newlywed told E! Online.

De Moura said Black had an issue with the timing of her May wedding to interior designer Frederic Marq and the filing of a marriage license. She and Marq "first got together about five years ago" but had been together for only a few months when he proposed. After she applied for the marriage license, she realized her son "was not showing too much enthusiasm" about the couple's nuptials.

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"He was 9 at the time. He actually really freaked out. He was shaken at the idea of his mom marrying someone else. It was too much for him. So we called it off," she said. "We had a license, but for my son's sake we didn't go through with it. The whole thing was very emotional. But now it's five years later, my son is older and we decided to go through with it. But now I'm hearing Lea's telling people I'm a big liar because we're already married."

The reality stars are also at odds regarding claims that de Moura relied on Black for money.

"She also said I had used her for money. That's a big lie," de Moura said. "When she did help me, it was way before Frederic ever came into the picture. My son's father and I had separated-he cheated on me with a young girl, and he left me with huge mortgages, huge financial liabilities, things I had to take care of.

"The economy was tumbling, my business was struggling, and what Lea did for me [was] bought some pieces of artwork, she bought pieces of jewelry for discounted prices. And now she acts like she supported me for seven years. She never paid my rent, she never paid for my bills, she never paid for my groceries, my car, my phone, nothing."

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Their feud will be a major storyline in season 3 of The Real Housewives of Miami, and de Moura said that is why Black is bringing up the issues now.

"I think its because this season, she didn't have a storyline. So she needed to attack me," she explained. "She sacrificed our friendship for a storyline. It got really ugly. She tried to put everyone against me. It made me think, 'You were never really my friend to begin with.' "

"When we have to see each other, it's awkward," she added. "I just kind of try to pretend she's not there."

The new season of The Real Housewives of Miami premieres Aug. 12 at 9 p.m. on Bravo.

Tags: Real Housewives of Miami Adriana de Moura lea black