@november90 Just to repeat what the other posters are saying and tell you my quite similar story.
I was with the father of my first son for 6 years. Was a whirlwind romance and we got pregnant very quickly but I should have heeded the warning signs as during my pregnancy he was awful. Constantly breaking up with me, saying he didn't want the baby, disappearing for days on end. In the end, it ruined my pregnancy. I stayed with him for 6 years but we were always on and off. He sounds exactly like your husband - seemed like he didn't care about me or his son, wouldn't converse, everything on his terms, constantly running back to his parents, esp mummy. When it finally ended, I missed him terribly and begged him to be my friend and a good father, which he never did. In the end, it took about a year of counselling for me to realise he was a narcissist and very emotionally and financially abusive. I look back now, ten years later, and realise, he actually only added stress to the early years of my and my sons life as it was constantly marred by arguments, Heartbreak and lies,but at the time, I felt I couldn't do it on my own, I needed him, I'd never even held a baby before, how could I do it without him. I KNOW now looking back, I could have done, as I have the most amazing mum and sister who helped me raise my son. It sounds like you have similar support and I hope that one day, what all this shit clears, you'll see yourself for what you are... A strong woman quote capable of bringing up 2 kids on your own. Much better that then to continue to be with him.
I'm not a single parent anymore, I was for about 3 years as my son now has no contact with his dad, but honestly, I look back now and I'm so proud of those days as a single parent. And you will be proud too of how you cope when all this clears. Keep your friends and family close, KEEP HIM AT A DISTANCE WHILST YOU HEAL (Mark my words, the way he's acting shows he won't give a toss if you and your family sit down and try to explain what he's put you through - Google narcissistic and see what you think), go and get some free legal advice (some places offer 30 min free) and so not budge on contact if you don't want to. I'd be quite wary of his parents as it sounds like they're enabling his behaviour. If my son had acted like your ex, there's no way I'd let him back in my house, so maybe rethink your contact with them.
Oh, and a final though, I actually discovered that financially, I was better off without him! So defo check out any benefits you're entitled to/what he should be paying regarding maintenance/House costs. I don't believe he can just up and leave without helping you with rent/mortgage costs if he's on the contract.
BTW, is anyone else feeling the baby Kick WAY low? I'm feeling her just above my public bone!