Boyfriend wants abortion

I'm so excited that I'm pregnant but my bf is not he don't want I was sure that I want it to keep it but I already have 3 kids from previous relationship but now I'm having second thoughts about having an abortion im not gonna b able to take care of my other kids obviously I'm not gonna b with bf anymore either way so I don't know what to do I'm scare I don't have family around to help me so I might end up doing it for better future for d kids that I already have