He bought HIS domain name that happens to (maybe) be your real name or a stage name.
The name yields many results including a .net on google.
He developed the name (which is usually not trademarkable when so common in use) and you didn't do anything for 5 years knowing full well he was using it and now you want to enforce it because you don't like the price he is offering it to you at?
Good luck.
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