I’m feeling so down

I just need mental support on how to go trough with having an abortion when my heart don’t want to do this I’m having an abortion tomorrow and before y’all start with should’ve used protection or been more responsible my boyfriend the man I been with on and off with was told years back he couldn’t have kids as his semen was dead and weak he suggested abortion and since I know we’re not going to stay together that’s why I’m doing this because I don’t want my kids to grow up not being wanted by the father when he explained before I never wanted a broken home and it breaks my heart to do this but if we’re not staying together I have to do this any advice on what you would do I feel like a monster