Ring on Right Hand Ring Finger

What does it mean? Long story short, I ended up on a YouTube video posted by my ex, and it only shows his hands. In one view, you can see he's wearing a dark metallic ring on his right hand. I know he's not married, but is it likely he's in an LTR (which is unlikely itself since he's a grad student, teaching a course once a week, working, and blogging about solo activities). Lately I've been wanting to reach out and make contact with him, but as soon as I saw the ring I was completely wrecked.

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