ABORTION choice help me

I'm 15 my boyfriend is 17. I took some tests they came back positive. I am 100% against abortion but he wants abortion. I don't know for sure but I think he'll leave if I don't get an abortion. I don't know what to do. I don't want to get an abortion but I don't want to loose him. I don't think I could handle the pregnancy without him. Do I keep the baby and risk him leaving? Or do I make my own choice and keep the baby? Please help.