Dear Rebecca: DON'T EVER LISTEN TO GOSSIP!
But you did, so did the "kind person" who told you that your friend wears his wedding ring when he is not with you, see him herself with it on, or was she told by somebody?
What I am getting at here is; there may be no truth in the story.
Ask him, if he still wears his ring, and be honest, tell him Mrs X told you he did.
It sounds to me as if it is not his behaviour you need to worry about, but the motives of whoever told you this story.