I know it seems petty to many people, but not wearing a ring to me is huge. DH doesn't understand it because his previous wife never cared.
Have I walked out of the hosue not wearing my ring - yes. They were accidents totally. I hate putting on lotion with my rings on, so I take them all off. If i am in a hurry with the kids, i might forget it.
It could be a very innocent mistake - it could be totally on purpose...its so hard to tell which one is true.