Men wanting you to have an abortion

I completely understand that it's your body and you're the one that has to go through with everything, but why is it that when a man wants a lady to have an abortion it's suddenly all "keep it" "it's your body and your baby" "fuck what he thinks and leave his ass"? If your partner isn't ready for a child and you don't even THINK about his views then you're just as awful as the men who don't believe in equality, surely?