Hi, firstly welcome to BB and congratulations

I know exactly how you feel (hug) I had the same issue with my ex partner.
We had baby number 1 in 2007 but had a lot of issues in our relationship (domestic violence, him going to prison etc) and I had to get my life in better order for my little boy so we broke up but being so young (15) I thought he was the one I loved (I know now that I was so niave(sp?) and have since opened my eyes). After he got out of prison in September of 09 we ended up back together for a few months and in that time I fell pregnant with my dd.
When I told him all he said was 1.it's not mine and then when he finally knew it was then came 2.ABORTION!!! was all that he told me. I was heart broken that that's how he felt. I was living with him and my brother and his gf at the time all whom agreed that abortion was the best option but I was dead set on having the baby and as soon as it was mentioned I left him knowing that it would not do me or my children any good being around him if that's how he thought.
He wasn't there for any of my midwife appointments nor the birth of my beautiful girl and hasn't wanted to be in her life since but will still have contact with our son. When my dd was 6 weeks old I met up with an old friend and there was fireworks almost instantly. My dd is now 8 months old and my dh has taken her on as his own.

I'm not pushing you into a decision about leaving your partner but I do agree with the others who have said that your relationship may need a reassessment and you need to do what's best for you and your baby whatever that might be.
BB is a great place for support but do you have someone close you can talk to about this? I know my mum was a great help for me.