I lied to my boyfriend about a pregnancy and a miscairrage, should I tell him the truth or leave it be?

Me and my boyfriend had unprotected sex, he came inside of me and everything. I dont know why we even took chances like that, just out of stupitity. I then assumed that I was pregnant. I told my boyfriend that I was and he told me to go to the doctor to be 100% sure. I told him that I made an appointment and that they confirmed the pregnancy, even thought I had never gone. I told him that so he would stop worrying and telling me to go. I just knew that I had to be pregnant, I had every symptom and everything. Honestly, I don't know why I never went to the doctor. He had told his mom and friend and 2 cousins about the pregnancy. I let this go on for 2 weeks to a month, when last week I got my period/ miscarried. I will never know for sure, but I'm pretty sure that I had my period. I then told my boyfriend that I thought that I was miscarrying and that I thought I saw the fetus, and I lied about calling ask a nurse. He was a little upset, but more of relieved that we would not have to carry on the responsibility of a child this early in life. He already had a previous girlfriend that got pregnant and miscarried at 3 months. We agreed to erase this from our minds, act like it never happened, forget about it and move on. We both feel as if it was a learning experience. I really love him with all of my heart and I know that he loves me too. I want to do what is best for him though, and I don't know whether it is better to tell the truth and him to be hurt, scarred, and have trust issues with me and with anyone. Or to just leave it be and think of this as a learning experience.for him not to get so hurt and stressed out. I don't know, but I feel so aweful...:( I love him and I want to have an honest relationship from now on, no more lies. I am praying and hoping that God will help me(and him) through this hard time. Should I tell him or leave it be? Advice is greatly appreciated, thanks so much.