• Do not share things with them that could hurt their feelings. For example, if their parents are driving you crazy, you do not have to tell them. That is a secret you want to keep to yourself. So, sharing that secret with your spouse, not a good idea. Why? Because if you tell your spouse that you do not like his or her parent's that could mean some fall out, they may take it too personally, after all it is their family. So, if you have something bad to say about family, say it about your own family.
• Do not talk to them about past lovers and boyfriends. Some secrets are better kept to yourself, like how you liked their best friend for the first year of your relationship, or how you kissed a million people, etc. These types of secrets should only be shared if asked directly, and even then, an answer like, "It really does not matter because I am with you now, and I love you more than anyone else." is best. Why? Because, while you may be curious, hearing about your spouse's past relationships can only cause hurt and insecurity in yourself. Why purposely dredge up something that does not need to be shared. Now, if you did something that could potentially affect your relationship, like if you slept with their roommate while dating him or her, then that is a secret you probably ought to tell them, however, it would have been best to tell them that before they became your spouse.

There of course are secrets that you should share. These are the kind of secrets that will make you closer because it gives you insight into one another's souls. For example, if you hate meat loaf, but politely eat it each time your mother-in-law serves it, this is a secret you can laugh about and enjoy sharing with your spouse. They will appreciate it, and they will know you love them and their family because you make sacrifices in taste for them.

Secrets are secrets for a reason, so you should always consider why you are keeping something a secret from your spouse. If it has the potential to really change your relationship if it came out, then finding an appropriate time to share it is a must. However, if it is just something from your past, then whether or not it really needs to be shared is up to you. Most would agree if it does not involve both members of the relationship directly, it is not worth sharing.