I've often heard couples proudly claim they don't hide anything or keep secrets from each other. However, I don't think all couples are like this. There are certainly some couples who keep secrets, even though they claim to be open with each other. I agree that trust is important in everything. If someone trusts you and is disappointed, they likely won't trust you again, which is why trust is so important.
But secrets or hidden things will eventually come to light. I experienced this myself, even though I tried to keep it a secret, but in the end, I revealed everything, and fortunately, my secret was understood. So, telling each other is important, and even if we talk it through, there will definitely be a solution, and our partners, who might be afraid, will accept it.
I initially hid my gambling activities, but over time, I tried to open up, and by talking things through, things remained safe.