I have one question am I a scammer too or did I do wrong by not sending him his Etherume back because after this incident my conscience has been beating me.
stay safe.
If you didnt return his money then that makes you scammer too. Its not right to keep the money that is not yours and its not necessary to ask for verification before you return it since you know better the money came from him. BTW, are you certain he is a scammer? Or is it just what you think because he messaged you first?
But to be honest with you guys I refund his Etherume not because I want to clear myself to you guys but because of my conscience. And I also believe what you did to others also comes back to you. I never want to be the reason why anybody cries.
Good decision. Regardless how bad the person is, dont make yourself similar to him.