Guys, if you were taken and you're usually not the type to wear jewelry what does this mean?

Hello everyone. So one of my good friends at work recently slipped on a ring on the wedding ring finger recently casually and recently asked me if we were just friends. What does this mean? Is it just a test? I mean everyone around me says it's just a test.
Guys, if you were taken and you're usually not the type to wear jewelry what does this mean?
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