Discovered husband has been stashing away money in secret?

We have been married for over 10yrs, have mortgage and child and have always had joint acc and wages paid into that acc. For a while ive know something wasn't quite adding up and now discovered when questioned that he has been saving money… HIS but sum doesn't add up right to what we jointly agreed to save independently each month. Plus he's hidden it never disclosed that he had these saving even when recently i had to borrow money from family.
When i asked him about these acc and what they were he immediately became defensive refused to explain any it only saying well what bout u! I am a spender but purchase spender hiding money away is different and worrying?

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