Ok so what is the BIG deal? Why is he passively bringing up an old issue about wedding rings?

you know him better than we do. We can't get into his head. I would just straight up ask him what his problem is anf if you could work on a solution. Yes from the little I know of him, it sounds like a control issue. He wants you to be marked with a ring but he is free to wear a ring as he pleases. You did nothing wrong. Sounds like he is being passive and dancing around the issue because he doesnt have leg to stand on! He wants you to wear your ring but will not come out and ask or demand you to because he is not reciprocating. Society has been condoning this behavior for years and years, women wear engement rings and men still have no "marking" of being engaged until after the wedding. I would leave it be. You won. Gave him a tatse of his own medicine and it doesnt feel good! If he starts wearing his ring again, say nothing and put yours back on a few days later. Or you can bring it up and have a long drawn out discussion. But either way, he is in no position to demand things or make you feel bad. He is trying to bully you into putting it back on. Don't get sucked in.