What to do I feel alone and hurt?

I have been with my boyfriend for 3 1/2 years and the first year was great he would tell me.nice thing, hold me, tell sweet things and told me he wants.to marry me and bla, bla,bla. We made love like everyday. He even would wait in the car while I was in school. He didnt have money. But then he said I motivated to make money for us. But then the 2nd year to know he tried to cheat on me and talk to old girls from his high school. I found out each time he told me it was nothing. Then I trusted him but it still bothered me. Well know that he is rich he call me a ***** ,that im ******* stupid , im retarted he slaps my face he tells me he wants to be a real man and get bitches and be single. It hurts becuz I was helping when he had no friends or money and now im broke and feel alone. Be doesnt want me to go out to clubs with him and his new friends. What should I do. I love him and I keep thinking he will be the same. What do I do