Advice

So I've been with a guy for 7 years we had our ups and downs but always made up. Last year November I got pregnant while we were on a "break" and he wanted me to have an abortion I was stunned hurt and broken but I didn't because after all those years I finally conceived. He tried talking me into not keeping the baby by using excuses about how we need to work on us and he wasn't ready. When after a few days he called to say keep the baby if you want I'm done with you we can be friends and I'll take care of the baby but we just can't be together. Idk where it came from but to my knowledge something was off the following week he was in a relationship and proudly moving around and doing stuff with the female who was now his girlfriend. We got into a huge fight about this female and he had the worst to tell me. She treats him better she understands him and what not leading me to believe they were already dealing before which was why he wanted the abortion. Rewind to now and they are still togther she has a daughter and he's happily up and down with them doing things with them as a family and proud to throw it in my face calling her his madam when he's talking about her to me. He calls me out my name all the time and still to this day argues with me or find situations to argue with me about. I'm hurt of course but I just feel like I need to keep this baby to myself and not have any dealings with him because eveything just hurts more knowing that he left his baby for another woman's own. Am I wrong for wanting to do this alone?

Edit: yes I'm keeping the baby I'm already 20 weeks

In response to a comment made I never got pregnant to keep him :/ we were together and having sex like any normal couple without protection he always asked for us to have a baby but I was told it'll take time and then it happened after we stopped trying. After 7 years why would I need to have a baby to keep him.