Have I been in the wrong?

[ThisTooShallPass1988]

I was with DP 10 years. I admit I wasn't the greatest partner, I suppose I was quite argumentative, could be a bit lazy and liked things my way.
We had 2 children. The youngest is 6 months almost. In 2020 I lost my sister and grandad, we had our wedding cancelled, it was just a crap year. He also started a new high earning job. Early 2021 I get pregnant. He then changed. I had hyperemesis and was hospitalised, he didn't support or believe how poorly I felt. He went abroad with our eldest when I was 7 months.
His parents came over at Christmas after visiting other family and going to public events - they brought COVID with them. I told DP it was selfish of them to stay with us having a newborn when rates were so high. He told them that and allowed and encouraged his father to shout and swear at me in my own home for calling them selfish.
I walked out with the kids to my parents this was at Christmas and I've never been back.
He told me it was over and he loves me but can't be with me. But then he'll text asking for sex? He sees the kids once a week. He says he's keeping the house as I gave up work to stay with the children so I can't pay the mortgage.
Is this all my fault?

Nope and you need to sort out a solicitor as that house or at least any equity is half yours. Plus pension plus maintenance - get yourself sorted none of it is your fault he was a selfish arse who should have protected you from his father not let him loose on you - that is abusive

Just realised he was a DP not a DH - so that means its not half yours unless you can evidence any contributions

My name is on the mortgage it's 50/50. But he won't leave and says I would be selfish to stay as I have somewhere to go and he doesn't as his parents moved abroad

You did the right thing by leaving when he allowed his dad to abuse you.

Can he afford to buy you out? Has he been paying maintenance?

Not one single part of that is your fault. None of it.

He can afford (or mummy and daddy anyway) to buy me out. Think he offered me around £20k but currently my name is still on the mortgage. I have literally no where to put mine and my children's stuff - my parents live in a 2 bed.
I keep thinking it's my fault and wondering if I had have been nicer or more 'normal' (I suffer anxiety and had PND) would he have made me leave.

Oh love, your anxiety is likely caused by the way he treats you, and PND is a medical condition and there is nothing you could have done differently about that.

Please take urgent legal advice, particularly about the property. Also make sure the lender knows what's happened, so he can't sell it without your knowledge.