have u ever do something really horrible but you don't feel so guilty about it?

recently, i did something horrible to someone who did something horrible to me too. but i did worst more than he did to me and i wonder how and why but i didn't feel any guiltiness towards of what i did. i didn't think of it as a revenge tho, i'm not that type of person lol. it's just that when i did that to him i felt a sudden pleasure, i feel good. i asked few of my very close friends abt it and they just said that 'i'm weird.' (_　_|||)