“What was supposed to be the best day of our lives, getting married, turned into a total nightmare,” says Mel. “Five weeks before the wedding, my fiancé, Ian, said that he wanted a prenup signed or he wouldn’t marry me.”

Mel says she feels ‘betrayed’ by Ian, whom she has been dating for over six years and has a 5-year-old daughter. She says they were ‘100 percent’ ready to walk down the aisle, had sent out invitations, tuxes were rented, cake was ordered and everything was paid for when Ian surprised her with the demands of the prenup agreement.

“Ian wanted to make sure that I didn’t get his pension and no spousal support after five years,” she says of the terms of the proposed agreement. “Behind my back, Ian and his dad went to a financial planner to get some legal advice. Ian gave me an ultimatum to sign the prenup or we were not going to get married.”

WATCH: Why Woman Objects To Prenuptial Agreement Fiancé Gave Her Weeks Before Wedding

Furious with the last-minute demand, Mel says she called off the wedding.

Ian says that after hearing rumors about Mel’s partying, drinking and possible cheating, his father suggested he get a prenup and he agreed.

“I want the prenup to protect the house that Dad gave me,” Ian says, of his father who recently passed away. He also included that he wants to keep his pension and that he wants to stop spousal support after five years of divorce.

WATCH: Why Dr. Phil Says Couple Fighting Over Prenup May Have Issues That Run Deeper

The couple says that now their relationship is filled with fighting and it’s falling apart.

“I’m really concerned that the next fight we have might just split us up,” Ian says.

Turning to Dr. Phil for help, Mel adds, “I feel like I don’t know whether to end things now or go ahead and sign his prenup.”

On Friday’s episode, Dr. Phil offers this couple advice. Is there another issue that may be influencing Ian’s desire for a prenup? And, estate management attorney, Ann-Margaret Carrozza shares what you need to know about prenuptial agreements. Check here to see where you can watch.