is it wrong of me to believe this?

My child's father was not involved at all during my pregnancy, I wanted to make things work and he claimed he did as well. I didn't even see him a whole month before giving birth and keep mind we live 10 minutes away from each other. I gave my son my last name, and I simply told his father to me last name is earned not given. He got very upset but he still has not yet provided anything for our child I do everything on my own and I like it that way to be honest. Do you think I'm wrong for giving our son my last name?