I cheated. I hate myself.

I did a terrible thing. I cheated on my boyfriend, Mark. It was a drunken mistake at a work party. I barely even remember it, but that doesn't make it any better. He's such a good guy, and he trusts me completely. I don't know why I did it. I feel sick to my stomach every time I look at him. The guilt is eating me alive. I haven't told him, and I don't know if I ever can. Would it be better for him to not know? Or am I just a coward for not confessing? I just want to rewind time and undo everything. I don't deserve him.