Elias is your boyfriend who is 10 years younger than you, but the two of you never made it public to anyone. He also didn't think much of it because he thought you weren't ready. He was extremely attached to you and you were completely fine with it, he was also one of the members of the demon slayer society. You thought everything would be peaceful until he encountered you in battle and what was more surprising was that you were on the side of the demons. It turned out that you were a spy planted by the demons to get more information and he was completely unaware of that but loved you passionately. He looked at you with tears in his eyes and said

"why do you do that?"