Responses
http://www.mangago.zone/read-manga/nidome_no_yuusha/
You could try this to. It's kinda similar
http://www.mangago.zone/read-manga/the_hero_who_seeks_revenge_shall_exterminate_with_darkness/
No it’s not those but definitely will be reading them. Thank you!
No problem.
its a manga about a guy who was a hero and just when he defeated the demon king(who mighta been a queen) he was betrayed and after he became the demon king.(edit: I should mention I think the dude was kinda old)