A billionaire couple has entered a bitter divorce dispute over the husband's massive fortune after his wife allegedly contends she did not know what she was signing when she agreed to their prenup. 

Miguel Fernandez, 73, filed for dissolution of marriage against his wife, Constance Tolevich Fernandez, 61, on March 20 in Miami-Dade County, according to the county court docket. 

Miguel is the chairman of MBF Healthcare Partners, a private investment firm in Coral Gables that invests in healthcare companies. His personal net worth crossed the $1 billion threshold in 2013, he told Florida Trend at the time. 

The couple entered into an antenuptial agreement in 2001, more commonly referred to as a prenup. Miguel's attorneys filed the petition in the 11th Judicial Circuit of Miami-Dade County. 

The agreement, viewed by the Daily Mail, stated that Constance would be entitled to $1 million if she stayed married to Miguel for over 10 years. 

Miguel has filed for the court to uphold their original agreement, which Constance's lawyers are contesting. 

The petition alleges that throughout their marriage, Miguel gifted Constance $10 million in investments and assets and $6.4 million in jewelry, including a 22.88-carat emerald and a 3.60-carat diamond ring. 

Miguel's lawyers also said Contance was allowed to use a slew of luxury vehicles, including multiple Ferraris, a Mercedes-Benz and a BMW. 

They added that he 'gave her untold millions upon millions of dollars’ worth of designer clothing, handbags, shoes, and accessories, before she flew around in Mr. Fernandez’s private aircraft, vacationed and cruised on Mr. Fernandez’s opulent yachts, lived a luxurious and glamorous life in Mr. Fernandez’s properties and received all of the other benefits that Mr. Fernandez earned from his humble immigrant beginnings.' 

Miguel is a Cuban immigrant. His story was featured in a series by the American Civil Liberties Union of Florida in December about his immigration story. 

His lawyers have argued that Constance had a background in business when she married Miguel and was not naive about legal agreements, citing her resume as a Chief Financial Officer and entrepreneur. 

Miguel's representation also alluded to Constance's previous marriage to a 'significantly older monied man' until he 'lost all of his and [Constance's] assets.' 

'[Constance] had moved from Detroit to Atlanta where [Richard] Scriver (her previous husband) resided, then after failures and lawsuits, [Constance] and Scriver moved to Boca Raton to engage in new businesses and ventures,' the filing states. 

While in Atlanta, Constance was the CFO of ACA Joe Franchise store and managed multiple restaurants, according to the filing. Miguel's lawyers alleged that Constance racked up debt after moving to Florida. 

Constance was also accused in the filing of 'at least one adulterous relationship' with one of her previous husband's business partners. 

The couple first met about a year before their marriage, while Constance was still married to her former husband, the filing states. 

The two initially struck up a business relationship, then dated for a year before she filed for divorce in March of 2020. 

'While dating Mr. Fernandez, [Constance] still kept who she was and her past lawsuits, debts, and experience secret from Mr. Fernandez,' the petition states.

Constance was Miguel's fourth marriage. He has four children from his previous marriages and one adult son with Constance. 

Constance's attorneys told People that the allegations in the divorce petition are 'unsubstantiated,' adding they are 'either completely untrue or the manner in which they are written is an attempt to portray facts and circumstances differently than reality.' 

'Mrs. Fernandez is a discreet and dignified lady. It is regrettable that this is the manner in which Mr. Fernandez has chosen to conduct himself in what should have been a private matter,' her lawyer added. 

'Out of respect for their five children, grandchildren, and their relationship of almost three decades she will not comment,' the statement concluded. 

Constance has not yet filed a response to Miguel's petition. A hearing has been scheduled for June 25. 

According to property records, Miguel purchased a sprawling Coral Gables mansion in 2010. Zillow values the home at a whopping $91.5 million. 

The Daily Mail has reached out to Constance's representation for additional comment.