Welcome to bellybelly! And congratulations on your pregnancy.

I'm so sorry for what happened with bubs father. He's being a total jerk, not to mention selfish! He might come to his senses at a later date. In the mean time, focus on YOU and your growing baby. If you want, you could stop talking to him completely, at least for a while.

In regards to child support etc. If you want, you can put "father unknown" on the birth certificate and still collect the maximum centrelink payments (which is parenting payment single, family tax benefit a & b and a few other allowances and possibly rent assistance). They can't deny you your payments just because you (theoretically) don't know who the father is.