Trust is one of the most important building blocks of all relationships. And any relationship can instantly go southwards if trust is broken. While some can have a hope of being salvaged, others might not be so lucky.
Just like today’s original poster (OP) whose marriage was caught in a great shamble after a friend convinced her to hire a private investigator and check if her husband was cheating. Although nothing was found, her husband realized what she had done, 2 years later. And now, her relationship with him is on rocky waves.
More info: Reddit