So, I was the main GM of an RP about two years ago based on the Miraculous TV show. I had a two co-GMs for moderation, but I was responsible for the idea and 99.9% of the writing. (The only thing one co-GM contributed was a skeleton character sheet). The RP died quickly due to internal drama, and now I've found out the co-GM responsible for most of that drama has rebooted my RP, with my concepts, and has even copy-pasted my own writing.

His RP: https://www.roleplayerguild.com/topics/169602-new-miraculous-rp/ooc

My RP: https://www.roleplayerguild.com/topics/126231-new-miraculous-tales-from-the-new-world/ooc

I wouldn't have felt this upset if he had used his own ideas or even his own writing, but now I feel violated as a writer. I wasn't even told about this until a friend found his RP and skyped me the link. What do I do?