My boyfriend will leave me if I don't get an abortion. Help?

We're both 19 and I found out last week I'm pregnant and we are both by no means ready to raise a child, we agree on this. But I can't bring myself to abort the baby, but he said he'll leave me if I don't because he cannot be a father. I have no idea what to do, I don't think I have a choice but to have an abortion. Please give me advice, as I'm so lost. hank you