Boyfriends friend hit me

Anonymous
ok so recently my boyfriend and I and his friend have been hanging out.. his friend has this weird issue with hitting me.. like for example he's always making fun of me for something I say or how my hair is curly and fluffy.. and if I call him a d*** for being rude hell slap my thighs or even go as far as to bite my arm.. this past last time he bit my arm so hard I still have bite marks and it bruised in the shape of his teeth..and when he did it I tried pulling his head away from my arm and he wouldn't let go until I smacked him in the face..and a little while before he did that he punched my leg so hard I felt the force of it go through my entire leg.. its a huge bruise..and I'm not just complaining for no reason..this guy is huge.. I'm 5'2 and 115 pounds.. he's at least 2 to 3 times bigger then me and he's built like a football player..hes a security guard he's always excersizing and lifting weights..so he has really strong punches.. he hit me so hard I started crying it hurt so bad.. he can hit a guy and knock him out with one punch..and he didn't even try and tone it down at all I'm much smaller then him.. I just don't know why he would hit me..a girl like that.. I do know he had an abusive father when younger..but I don't know what I should do or why he acts this way..please help..if you read this all answers are accepted.. please..
Boyfriends friend hit me
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