first baby, alone now, need guidance

I got pregnant with a new guy pretty fast.  It wasn't really working to begin with...he has unhealthy habits, is very selfish, I kind of did everything for him and his 3-year old son, and started to feel resentment for doing everything.  He lived his life as if he was single, and I got more and more frustrated.  The main issue was his ex - his son's mom.  I understand they need to be in contact for their son, and I supported that aspect.  However, he talked about her every day, texted her all the time, and she was always asking for favors unrelated to their son.  I asked him over and over to not bring her up so much because it was making me insecure and yes, jealous.  It was our relationship, not theirs.  I found out I was pregnant and he was SO excited.  We told our families early on, separately, and I started to show pretty much immediately, so my work knows too.  He mentioned him and his ex are still on the same cell plan and he's always fronting her $ to pay...sometimes she pays back sometimes she doesn't.  Mind you, he makes more than me and is ALWAYS broke, and I am always paying for things, so I said listen...you need to take her off you have been separated for two years almost!  A few days went by and we had a horrible night.  The next day I was at his house and he was telling his roommate that his car insurance bill was REALLY high because his ex is still on that with him too.  I lost it!  Him and his roommate kept talking about her like I wasn't there and I said...you need to remove her from your bills and fast. Like NOW. I am over this!  This is ridiculous.  Sigh.  He told me that I have no right to demand him to do anything, to get out of his place, and get an abortion.  We didn't talk for 4 days through the 4th of July weekend.  I had asked him for his family health history so I can bring it to my dr tomorrow and he never responded.  So...I reached out to his mom on facebook.  He called me at work and said to stop bothering his family, they don't have time for my pettiness.  and that I am no longer welcome in their lives, and he will pay cs when the baby comes but wants nothing to do with me.  I just listened to him and just hung up on him.  I am heartbroken, but I think he should be more understanding that I want to be important in a relationship and it's not all about his ex.  I merely asked for respect and consideration, but he said I asked way too much of him.  In reality, he didn't do anything for me.  I texted him and told him I will no longer waste him or his family's time and removed them from fb...except him.  I want him to see updates on the baby...but should I just remove him and be done?  I am just so full of emotions and hormonal changes...I can't believe he's done just.like.that.  any advice?  I am in the analyzing phase now...what did I do wrong and can I do this alone?  I feel like if I just end it, were done with each other for good.