I Suffered a Broken Heart and Became a Nerfing Character

Me and my D-class power couple. But my girlfriend suddenly reawakened and miraculously became an S-class. When I tried to congratulate her as soon as we met, she suddenly rejected me. After getting dumped by my girlfriend, a certain incident occurred the next day, and a status window appeared, and from that status window, I gained the ability to 'nerf' other people's abilities. (It's a hunter story where the main character is a villain.)