Why do couples keep their financial info to themselves when they are married?

I remember reading awhile back that some couples will go through their marriage without knowing what the other is worth. Could this be a reflection of what happened to them in their past relationship? For example: i thought being honest was the norm like seeing my parents share everything but when i did that with my ex and treated her right i can't help but think she stole from me. She was a liar and cheated on me in the end. Is this the reason why when i want to get into another relationship i expect my new partner to self sufficient and not tell each other our worth?
Why do couples keep their financial info to themselves when they are married?
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