I agree that secrets are bad, but at the same time, is it really fair to share what someone shared with you in confidence to your spouse? I mean, if it's something that affects you or your spouse, or something that could be inappropriate, that's one thing. But if it's someone else's secret, like that they're struggling in their marriage or financially, I just don't think it's always good to go talking about what they told you to your spouse. Who would want to go talk to a minister about issues your facing if he was just going to go tell his wife about what you said? You might think ministers are different, but I think that there's not a broad-brush stroke answer to this. Gossip is not good and sharing things that people tell you in confidence is not good. If it doesn't involve you or your spouse, I don't see a reason to tell your spouse and think it could possibly cause problems or destroy trust.
One example I just thought of is, what if my mom came to me about a personal issue with her and my dad? Am I obligated to tell the details to my wife? I don't think so.