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Here is the link for the Texas bigamy statute.
Since you aren't the one who brings criminal charges (but rather it is the state that does so), it is up to the prosecutors to bring the charges or not. It is not dissimilar to adultery...many people commit adultery and it is a crime in many jurisdictions, but it isn't often prosecuted. If your husband does through with the "marriage" to the other woman, you may wish to call the prosecutor's office and obtain their stance on prosecuting for it.