While most divorces in the State of Texas are no-fault divorces, some are based on one spouse’s wrongdoing. However, the fact that it is legal does not mean that infidelity will not affect the outcome of your divorce case. It is not uncommon for spouses to wonder if infidelities such as this are illegal, and the simple answer is no, they are not illegal in the State of Texas. If your spouse has entered into an affair outside of marriage, it is likely a painful jolt that could make you either consider-or move forward with-divorce proceedings. Updated AugDoes Cheating Affect a Divorce Settlement?