Whether your spouse's actions are illegal or just ill-informed really isn't the issue. Calling it a name doesn't get you your money. And a chunk of whatever is in that account is very likely your money.
Texas is a community property state, and I'll assume that you and your husband do not have any sort of prenup or marital agreement. One of the many rules of community property that may apply to your situation is what is usually called the "income rule." Generally, income earned during a marriage is community property, and wages are a great example. If your husband is depositing his or your wages into his secret account, he's hiding your money from you.
You need to get a handle on this before it gets out of hand. You might begin by educating your husband on community property, or directing him to any of the many resources on Texas community property principles that are widely available.
This answer does not constitute legal advice. I am admitted to practice law in the State of Texas only, and make no attempt to opine on matters of law that are not relevant to Texas. This answer is based on general principles of law that may or may not relate to your specific situation, and is for promotional purposes only. You should never rely on this answer alone and nothing in these communications creates an attorney-client relationship.
Sign up to receive a 10-part series of useful information and legal advice about the divorce process.