I am (26f) 7 months pregnant with a married man's (33m) child

I don't even know how to start this post. I want to start off by saying, I had no idea he was married, until about a month in a half ago. He lied about that. My company has many locations all over the US and some overseas. A year in a half ago, I was asked to help, with numerous other employees from my location and other ones, open the newest location. I was there for 3 months and in that time I met X (not his real name or initial) and we hit it off immediately. He was one of the managers in the division I work within. We started "dating" and our relationship was very sexual from the start. I never thought it would continue after I left to go back home. I live 5 hours away by plane. He always told me he lived with his college friends so we would hook up in my place for the time I was there. That should have been red flag number one, but I also had something similar going on back home. I live with 3 of my sorority sisters. So at the time, I thought nothing of it.
My three months are up (some people stayed longer, but I wasn't one of them). X and I agree it was fun while it lasted, but we need to get back to our real lives. A few weeks pass and I get a call from saying he misses me and wants to see me again. I remind him we agreed to move on. He said he knows, but couldn't stop thinking about me. We end up calling and texting each other everyday. Some were very sexual. We even did the whole phone sex thing and FaceTime. He comes to see me shortly after that. We didn't leave my room for the whole weekend. I flew out to see him a few months after that. Again we have sex the whole time in a hotel. A few months pass by and he comes to me, this is the time I got pregnant. When we weren't together, we were still talking, texting, sexting, etc every day.
I tell him I'm pregnant and he was not happy. I figured it was because of our situation. He starts ducking my calls and texts. I had planned to get an abortion (please don't lecture me), but after about 3 weeks he reaches back out and tells me he's sorry he reacted that way and was excited (he still didn't seem to be excited), but didn't know all this would work because we live so far away. I agreed and said we still had time to figure it out. He ends up flying out to see me a few weeks later. We hooked up and barely talked about the baby, which is what he claimed the trip was for. He met my parents. We eventually decided to keep the baby and would make things work. He said he would visit and I could as well.
Fast forward to recently (a month in a half ago), I was on white pages looking up his address (he had told me before, but that one turns out is his friends) to send him a birthday gift and found out his lying cheating ass was married. I called him immediately and he tried to deny it at first, but then eventually told me he was and hated her. A few days later he tells me he had kids with her and had never planned to be involved with our child. Now, he's blocked me (I assume) it goes right to voicemail when I called him. He doesn't answer my texts or emails.
I feel so ****ing stupid for falling for all this bull****. I can afford to have my son on my own, but I'm so disappointed how all this panned out. X is a ****ty ass person and I'm sure he does this to his wife all the time. Even though he claimed I was the first and only. I just don't know what to do. I feel like I've been living in an alternate reality since this happened. I feel sick when I think about him.
Sorry for any mistakes, I'm sobbing as I write this. If anything wasn't clear, I'll clarify in the comments below.
TLDR: Baby's father is a lying cheating pos. What should I do about this?
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EDIT: I have contacted a lawyer and am hoping to hear back from him so come up with the game plan!
Edit 2: I tried to answer all the questions/comments, but I'm sure I missed many so feel free to message me directly if I didn't respond to you!


Source.