"Will Momey Destroy Your Marriage?" // Bomb made of dynomite and money with a timer(Photo: Richard Pierce)

An award-winning performing arts professional, Joni Robbins* had two kids, a spacious Manhattan apartment, and a successful production company built around her creative collaboration with her husband. Their glamorous, fast-paced life was the envy of her friends — until the night Robbins took the dog out and grabbed her husband's jacket instead of her own.

The coat felt strangely heavy and stiff, and when Robbins looked inside, she discovered the lining had been cut open and stuffed with mail. "Out of this jacket comes somebody else's financial nightmare, except that my name was all over it: years and years of liens, warrants, tax notices, eviction notices, repossession notices, tuition overdue notices, health insurance cancellation — we hadn't had health insurance in eight months, and we were about to be evicted from our apartment," she says. "We were three weeks away from living out in the park. It was horrifying."

When she confronted her husband, he offered no explanation. "He shut down completely," she says.

Throughout their 13-year relationship, Robbins had managed their corporate business while her husband handled their personal finances. But while she signed their tax returns every year, he apparently never filed them. "I had no idea I wasn't paying taxes," she says.

Robbins eventually learned that their debts exceeded $750,000. She insisted they go into therapy, but a few months later her husband abruptly left her, and she found he had been having an affair. Robbins is now getting a divorce, negotiating with the IRS, and struggling to make sense of what happened.

"My life as I perceived it wasn't my life," she says. "All I thought we had and were wasn't true at all."

Robbins still can't get over the fact that her husband never shared their financial troubles or let her help deal with them, a choice that left her feeling deeply betrayed. That reaction is a telling sign of the times; in previous eras, wives often had very different expectations. Back when everyone assumed that men made the money and the decisions, women didn't necessarily believe they were entitled to share information, let alone power. But today, marriage is typically viewed as a partnership based on mutual trust, and when one partner violates that trust by keeping financial secrets, lying, or making unilateral decisions that threaten a family's welfare, the other partner can feel profoundly betrayed by a transgression that may be even more destabilizing than an affair.

Such betrayals became increasingly visible during the last couple of years as the recession forced financial problems out into the open and people's debts caught up with them. The latest data shows that financial infidelity is rampant. A survey by the nonprofit CESI Debt Solutions revealed that 80 percent of spouses spend money their partners don't know about, and more than two-thirds of the respondents had had a relationship affected by financial dishonesty. Another study, commissioned by the National Endowment for Financial Education (NEFE) and Forbes Woman, found that three in 10 Americans admit to financial deception with their partners. Of those, nearly 60 percent had hidden cash; more than half had hidden purchases; an additional 30 percent had hidden statements or bills; and 34 percent said they lied about finances, debt, or money earned.

Women are victimized more often than men: According to the NEFE study, 65 percent of women said their partners had lied to them about finances or debt, compared with 47 percent of men. Among those who were deceived, more than 40 percent said it damaged the trust in their relationship, and for 16 percent it resulted in divorce.

"Money is this massive pink elephant in bedrooms all across America, and the problem has been heightened in the economic downturn, which is a painful backdrop for dealing with an issue that nobody wants to talk about," says Manisha Thakor, a personal finance expert and author of Get Financially Naked: How to Talk Money With Your Honey.

The reasons for financial infidelity can vary. Some men conceal financial assets because they're secretly preparing to leave their wives, while others lie to their partners even as they remain committed to the relationship and expect it to survive.

Ann Hopkins* thought she and her husband had a wonderful marriage. "He was my best friend," says Hopkins, a stay-at-home mother who raised their two children in an affluent suburb in the Northeast.

Then one day her husband, a successful corporate executive, came home and delivered some unbelievable news. "I thought we had a few million dollars, but he said, 'We have nothing left,'" Hopkins reports.

Her husband had gambled away everything they owned on bad investments and unsuccessful day-trading. "Not only had he lost everything, but we were $240,000 in debt, including student loans I didn't know he had taken out to get our kids through college," Hopkins says. "I went to see a lawyer, and she said, 'Face it — you are destitute.'"

They sold their house and separated, although they did not divorce. Today, Hopkins lives alone in a room she rents from a friend, and she works for an event-planning company. "I have nothing — no pension, no equity, no nothing," she says. "I don't even have a place where my kids can come and stay with me on holidays. We have learned to be poor, but there isn't a day that I wake up and am not afraid. There's tons of grief. I lost my whole life."