Depending on the situation but as partners, there should be no more secrets anymore. That's the reason why you're already tied up to your partner and you shouldn't hide any secrets longer. The reason for most divorce and break ups are not really affairs but about financial matters. And gambling is one of the reason why someone in the relationship is having a break down of his finances because of potential gambling addiction.
Of course, the impact is extraordinary. Sometimes, some husbands are reluctant to tell the truth and only share their work results if they win. Even if they lose, they will try to borrow money outside without their partner's knowledge. This is the beginning of the family's economic decline, especially if they are constantly forced to gamble and keep losing. Sometimes, if the wife has her own income, it's not a major trigger for rifts, but if she relies solely on her husband's income, it can be quite noticeable, especially when she already has significant expenses for her children, including school fees for both secondary and tertiary education.