Pregnant, alone, and heartbroken

Hi I'm 18 years old and just found out I'm pregnant with my boyfriend of a years baby. At first we were nervous but he made me feel so much better. He bought us baby books and started picking names out and then one day when he told his parents he called me and said he's done with me. He said he wants me to give it up or he won't have anything to do with the kid. I cried and begged him to not do this and then he told me yesterday he would think about all of this and tell his parents how much he loved me. He wrote me a letter this morning telling me he's moving to Oregon today and wishes me the best. Now I am alone and scared and don't know what to do. Please help me. In so heart broken I can't breathe.