All I can think about is that a drunk man speaks a sobber mind. When people get drunk they normally have the courage to do what they couldn’t or always wanted to do when they are sobber. Cannibalism is a serious thing it’s very dangerous and and abomination. It’s sad what happened to his girlfriend but he has most likely have been wanting to try this for a while and didn’t know how to do it so I personally believe that the party was a excuse to execute the boyfriend’s plan. Either way it’s very sad and not good.