“The CA Court created two classes and the SCOTUS likes to apply the Equal Protection Clause”
Simply having two classes isn’t in itself a violation of equal protection. Convicts are different from law-abiding people. Single and married people form seperate classes. No one cares about the 14th amendment in either case. We don’t care because married people have been granted special status through the due process of the law. They had to go through certain steps, steps which single people could also go through, if they so desired.
The small group of gay people who remain legally married likewise went through what was a legal process at the time, and they retain their status even though the law has changed I assume because they’ve been “grandfathered” in, or however you put it.