Have you ever cheated?

I was always so against cheating because it's just wrong. But my last relationship I was treated so horribly. He was mentally abusive and manipulative. I lost weight and was always just so so unhappy. He would do something wrong and somehow I would be forced to apologize to him. I worked with this guy who was charming and nice to me. He was funny and he was hot lol. He asked me if I wanted to have sex one night and I said yes. I lied to my bf and said I was working late so me and the other guy could have sex. I knew the whole time I was wrong but I did it anyway. I did it 2 more times after too. I just felt like I was justified in doing it. My bf treated me like dirt and this guy was so nice to me. I knew all he wanted was sex but it didn't matter. Am I the only one who has justified cheating? I just wanna see what others have to say.