Help, advice..

My daughters father is my ex boyfriend from high school. We broke up after 5 years together in 2016. Last year in October of 2018 I was single and he claimed he was too. I had been in a terrible place mentally because I was actively trying to become pregnant with my ex fiancé before calling it quits in October. I was just being dumb and upset about not getting pregnant and ending my engagement, so we ended up seeing each other and ended up pregnant with my daughter (due july 26th). My dilema is, when I found out I was pregnant, I immediately let him know. He blocked me on social media including my phone number. He apparently was never single and he doesn’t want his girlfriend/babymamma to find out he stepped out on her. Which honestly I feel really bad that I let myself get into this mess. Anyways, I tried to reach out to him recently and he didn’t bother to respond to me but he talked badly about me to one of our mutual friends and of course came and told me. Totally feels like high school drama. My dilemma is, am I doing the right thing by keeping quiet and lying to everyone solely for his benefit? I feel horrible and alone. While he is not taking any responsibility for our daughter. What should I do