Pickles, I doubt it's him you really need but the reassurance that someone loves you and is there for you. As you say, you want a cuddle. Someone to say it will be okay and until the baby, that was him yes?
It is very scary feeling as though you are facing life alone with a baby on the way. But this is going to be the making of you. You change so much when you have a baby, particularly IMO, if you are a young age having one. I had my first at nineteen and wow did I change.
You need to try and keep yourself busy, not focus on him. This man didn't want a baby, didn't adequately ensure that it didn't happen, walked away from his responsibilities and appears to be seeing someone else already. He is no good for you and I doubt very very much that he will ever be the partner you want him to be. He tried to blackmail you into an abortion by offering you marriage and a baby in a years time. If he really was willing to offer that, then he would still be with you right now. You deserve so much more than a man like that.
When I split with stbxh and became a single mum to four, I struggled. More than I ever let on to anyone. I didn't miss him. I missed having someone there desperately. Someone I could rely on, someone to hold me when I was sad or stressed. It took a couple of months but i adjusted and actually started loving the fact I could look after myself, cheer myself up when sad, be responsible and make decisions alone. It's a very empowering feeling. Hang on in there, you will have your baby really soon.