Fiance Problems...

Freedom
So, I'm 19 weeks pregnant. My fiance and I have been together a little over a year and when we found out I was pregnant, we had just gotten engaged. I wasn't sure about the pregnancy because he forced me to get an abortion in July and cause he already has a 3 year old who he never takes care of and is just a very difficult child because of her home life.. Anyway, long story short. He cried on my stomach and begged me to keep the baby. So I did. I wanted the baby, but I wasn't sure about him being an actual full time dad. I want my child to have the best life possible because I had a horrible childhood. And now, our relationship has gone from okay to bad to terrible and I don't know what to do. He blames me all the time for our relationship problems, we never cuddle or kiss or touch. We don't even spend time together anymore... And we're constantly fighting. Also, I've noticed he's always on his phone and won't leave it in the same room with me. He's like paranoid over it.... What should I do? Any advice? :(