Boyfriend is forcing abortion and being abusive...

He's been gone for about a week out of town while I stayed here. He accused me of going out and cheating but I didn't. So he said that we have to get an abortion because he doesn't want to be with me anymore. Once he got back home get said that he will quick me in the stomach if I lie about cheating but I'm not! He punched me a few times in the arm and slapped me. But then turned around minutes later and started kissing on my belly. I'm so confused. I don't want to get an abortion but he keeps mentioning it and then turns around and becomes interactive with my belly. Idk what to do... I'm 20 & hes 29. We just found out about three days ago but it was confirmed yesterday.