I lied about being pregnant and having a miscairrage I think, should I just fess up to my boyfriend?

A month ago I could have sworn that I was pregnant. I had every sign and symptom, and I just felt pregnant. I told my boyfriend that I was pregnant. He told me to go to the doctor and make sure. I never went because I just knew I was pregnant. I know that I should have, and I told him that I went and they confirmed it so he wouldn't worry anymore. I kept telling him that I was seeing a doctor when I really wasn't, and I don't know why I did it. I started bleeding a week ago and assumed that it was my period or I miscarried. I will never know for sure... I told him that I miscarried and that the fetus and tissue came out. He wasn't too upset but he feels like its a learning experience for the both of us. We agreed to forget it ever happened and move on. We both want me to get on birth control and just to erase it from our minds. But I can't., because I don't know if I was ever pregnant or if it was a 'hysterical pregnancy' or what. I feel aweful, should I tell my boyfriend the truth and him hate me? Do you think that God will ever forgive me? Thank you so much, any advice really helps.