Why do men feel it necessary to hit women?

Why do men hit women who are loyal, good, faithful and rude or die. I have been spit in the face, he gave me a black eye last night, and bruised my ribs. I have no family and no one to help me. . He is also on my lease. I have no one. What do I do to get him to see that he is slowly killing my self worth and beating me down to where I want to give up?