When reading your post, I got few things in my mind to write you.
First, it depends on, what the secrets are about. Of course, some women may have serious things, they conceal, but sometimes we just act like women.
Well, for first, we, women, like to have some secrets. It is normal. If the secret is about her dreams, wishes, or about what her friend told her, dont worry. This is nothing dangerous.
Secondly, sometimes we equivocate, when we dont know how to expalin our mind to men. It is not really, that we have some secret, sometimes we even want to speak about something, but we are not sure our husbands would underestand it or they would listen, or sometimes we just dont want to trouble them with womanly problems.