You may consider contacting a divorce lawyer in Texas and exploring the benefits of representation to guide you in this matter. Whether he does or does not ultimately end up using a lawyer, it is likely to your benefit to enlist legal counsel to help you know all of your options at every step along the way.
Although some individuals get divorced without lawyers, it's always wise to have legal representation helping you pursue your best interests -- especially if your spouse is retaining counsel. Although this following info does not qualify for NJ, it is designed for NH residents who are facing the same question. It is recommended that you connect with a local attorney about the specifics of this case. The benefit in the long run may be significant.
You'll definitely want to consult with a trusted, local attorney. If helpful, even though it only pertains to residents in nearby New Hampshire, please see this link below for tips on how to secure sole custody (and challenges to doing so).