First of all, I am not an attorney, and this would probably be a better question to ask one
If the home was bought in Texas, the Texas Buyer's Representation Agreement under Paragraph 11 Brokerage Fees, section C states:
"Brokerâ€™s commission is earned when: (1) Client enters into a
contract to buy or lease property in the market area; or (2) Client breaches this agreement. Brokerâ€™s
commission is payable, either during the term of this agreement or after it ends, upon the earlier of: (1)
the closing of the transaction to acquire the property; (2) Clientâ€™s breach of a contract to buy or lease a
property in the market area; or (3) Clientâ€™s breach of this agreement. If Client acquires more than one
property under this agreement, Brokerâ€™s commissions for each property acquired are earned as each
property is acquired and are payable at the closing of each acquisition."
You may have triggered the breach clause in the agreement because of purchasing a home while under an agreement without going through your agent. I would suggest that you consult with your agent's broker and discuss the situation with them.
Hope that helps,