Stuck 😶

My husband isn't the same man I married. He's turned violent recently. He slaps me, hits walls, steering wheels and whatever else is near him when his ticked off. I don't know if it's stress ,or this marriage or if it's because he's only 19. I've told him that if he doesn't want to be with me, he can leave. And he always claims that he's madly in love and can't live without me. After he hits me he says sorry and that it'll never happen again. Obviously that's not true. I'm afraid the hitting will get worse. I'm afraid to bring children into this marriage. I don't want to lose him , but I can't deal with this any longer. Is anyone reading this? Please help me. Guide me into the correct direction.