The best advice is to not date, at all, until the divorce is finished.
Just because you are living apart, will be living apart, have been living apart, does not mean you should start dating. In Texas, there is no “legal separation” step in the divorce process. Can I date while going through a divorce? Is it OK to date someone even though the divorce is not final? Can I start dating if my spouse and I are separated but not yet divorced? Dating while a divorce is pending is a common question.