The rings could be friendship and/or tokens of their love rings. They could also be putting up a front to those who enter the church so that they think that they are married, which they aren't. Being greeters may give them a "standing" in the church right now and most likely they are just trying to fit in w/the congregation. They want to appear as good people to everyone and one of the ways to do so is being greeters. I, personally, call this "role playing".
I wouldn't worry too much about their behavior. If it ever gets out, well...people may look at them a little differently.
BTW, I am Catholic and from where I'm sitting Catholics don't pay too much attention to separations/divorces and affairs as much as they did when I was a child. Sure, adultery is a sin in the eyes of God, but people today just don't pay as much attention to the 10 Commandments. It's like it's become acceptable and part of the times we live in. Now, it's a bit different if you want to remarry and you have to go through the annulment process...but here in my area...I even had a Priest have an affair w/a member of the Church many years ago and no one said anything about it at all. It's sad when you think about what you were taught as a child and how much things have changed due to the current times.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
