My boyfriend said that he'd really like to hit me. He said that sometimes, when he's mad at me, he'd love to punch me really hard. That scared and shocked me so much. I don't know how to deal with it. He's usually not the violent type, and we all sometimes have urges that are bad and we don't act on them because we know better. But how can I know if it's just one of those urges, or if he one day will do it?