The survey conducted by UK family law firm Slater and Gordon established that 1 in 5 people are keeping a major secret from their partners and about one in four of those people admitted that the secret was so big, that it could end their marriage, the Huffington Post reported.
These marriage-ruining secrets include money troubles, pornography, infidelity, and contact with a former partner and past relationships, among others.
It was also found that around quarter of people had kept a major secret hidden for more than 25 years, and 12 percent said they had gone to extreme lengths to hide it. In fact, 28 percent believed that telling the secret now would actually make things worse.
Amanda McAlister, head of family law at Slater and Gordon, however, advised that people should try and be as honest as possible with their partners because couples are often more hurt by the lies covering up a mistake than a mistake in the first place.