Advice?

I’m currently pregnant (super happy about it ), but my bf isn’t so happy , he has a child already and we somewhat planned this baby , well once I told him I was pregnant he started talking about how I should get an abortion or how I need to leave . I told him I am going to leave Bc I would never have an abortion especially after everything. Well it just hurts me so much Bc I see how much he loves his son , there is some days where he will kiss my belly or rub it but I just push him away. I’m not planning to stay with him Bc I definitely choose my baby over him . But I just don’t get it at all.