I got d in my boyfriends dream.

My boyfriend had a dream, that he was at football and he was getting issued his pads and stuff. I guess someone off the team took me in like a shed and started raping me. He said I had duct tape over my mouth to where I couldn't scream for help. He said he barely heard my screaming, and he went to see what was wrong, and he saw me crying hysterically, and he had no idea what was going on. He asked if I was okay then he realized what happened and beat the **** out of the guy. My question is why would he have such a horrible dream?