He also scammed me. I lost 110€. 
You can see our chat here: https://imgur.com/a/xJBZhEx

He changed the message with the address after I sent him the money (you can see this by the pencil besides the message).
His excuse that he sent me a bitcoin address is totally wrong. I know how a bitcoin address looks like and my wallet wouldn't let me send eth to a btc address.

Please flag him. He will scam a lot more people if you don't do it.