That isn't fun you need to lay down the line. My ex bf used to behave this way and no matter what I said or did he never stopped and it scared me that he would slap me pretty hard on the leg if I ever said something like you did!! Next time he does it treat it though you would a dog! tell him to back off and to stop hitting you because it is disrespectful. If he doesn't stop leave him because no "man" should hit his gf