And if trust breaks down in a marriage, it’s hard for the rest of the bonds holding two people together to remain intact.
Trust is not something you can demand from another person. It takes time to develop, but it can be lost in a moment. Once lost, it will likely take much longer to regain that trust again, if ever.
I don’t believe trust is all that hard to understand. If you do what you say, and say what you do, consistently, you can be trusted! I talk about that very thing here.