You cannot introduce someone as your spouse three times without being considered legally married.

The Law

Texas strongly upholds the concept of common-law marriage, allowing couples to bypass a formal ceremony if they live together and mutually agree to be married. A key component of proving this union is holding out to the public that you are wed. The urban legend claims it takes exactly three public introductions as 'my husband' or 'my wife' to accidentally bind yourselves together legally, though the courts are a bit more nuanced.