Hi Freckles
Sorry to hear you're going through such a tough time. It does sound like he's having a vicious sulk, and behaving very unfairly. The two of you are obviously at loggerheads over this issue, but choosing to go ahead with your pregnancy is really something only you can decide. I take it you weren't actively trying to TTC?
I can't offer you any advice really, except to say I have also spent most of my pregnancy with an unsupportive partner and no-one nearby in RL to talk to about it. Mumsnet has been an absolute godsend, I have been able to get advice and support for all the aches and pains and ups and downs along the way. Me and my DP were ttc for 2 years so this pregnancy was definitely planned and very much wanted, but he has been a less-than-ideal partner for most of it. He won't touch or look at my bump and generally ignores me or walks away if I try to talk to him about the baby. I've resigned myself to getting through the pregnancy alone, and possibly being a lone parent at some time in the future. However, I am not planning on leaving just yet. I really hope we can sort things out and eventually enjoy the family life we always planned.
I take heart that some posters on here have had unsupportive partners who have turned into good dads once the baby is born (I think the saying goes some men don't become fathers until they hold their baby for the first time). Some people are just repulsed or frightened by pregnancy in general. And some lack the emotional intelligence to bond with their unborn child.
I know my DP becomes withdrawn, cold and unsupportive when he feels frightened or under pressure. Pregnancy seems to have brought this out in him, we had a scary first trimester as I had bleeding for several weeks, and at 18 weeks we had a scare with a possible parvovirus infection. He recently told me he just doesn't want to get his hopes up and bond with the baby yet, even though I'm now 30 weeks along!
I hope you can stick to your guns. Don't even entertain a conversation about whether you want to continue the pregnancy or not. You're going ahead and it's up to him if he wants to be involved. It might be worth giving him the grace of a couple of weeks, to see whether he will come round when you go for your first scan? Perhaps seeing the baby will help him realise it's actually happening and help him bond?
I second the previous posters saying try and reach out to people in RL. The fact he got annoyed when you told your mum shows he knows he's being horrible and unreasonable. And keep posting on here if you need to, it's amazing how supportive and kind random internet strangers can be! 