Need advice

Iman

Me And my boyfriend have been having unprotected sex. One month my period was late and he thought I was pregnant, and I had told him if I was I would not be getting an abortion. Later that week my period finally came on. My last period was June 10th I have went to my health care provider and they confirmed I'm pregnant. He has 3 other children and doesn't want anymore. I don't want to go Thur with an abortion but he seems that's the only option. I want my baby but I don't want to become a single mother. I feel that he is being very selfish and not thinking of my feelings. How do I tell him that I don't want to go Thur with having an abortion? Please help.