You need to contact a family law attorney immediately. Take your paperwork that proves that you are husband and wife - the real estate, accounts, etc. Paperwork is your friend. His new marriage is not valid because you can only be married to one person at a time.
The Texas Family Code provides that a marriage is void if entered into when either party has an existing marriage to another person that has not been dissolved by legal action or terminated by the death of the other spouse. In other words, your husband's "new marriage" is void under Texas law.
Ms. Brochstein is correct, you need to contact a family law attorney immediately and provide as much documentation that supports the existence of your common law marriage.
To meet the statutory requirements for a common law marriage, the parties must (1) agree to be married, (2) live together in Texas as husband and wife, and (3) represent to others in Texas that they are husband and wife.