I just clicked on your name and it goes to a page that lists your activity. Maybe that’s where this stalker got that information from. I wonder if the mods have any info regarding who clicked on your name the most.
One question though, how would the stalker make the connection between your YW-CR username and your username on the other website? Did you give out your name or any identifying info on either website? Maybe it’s someone close to you whom you personally know that knows your screen names?
Good luck!