@Spikyseason I think men often don’t really want kids, and sometimes they have to get to know them and fall in love with them. I have to be honest that my DH really only acquiesced to them because he knew I wanted them and his parents were desperate for GCs (no other avenues for them). He found it really hard when they were young, and I sort of realised having seen him look at his baby god sons as though they were alien creatures but grow into the role once they were old enough to learn ball skills and he was able to find a way to connect when they were older.
Thing is, whether your DH kind wandered into fatherhood inadvertently or not, whether he understand was that actually means in terms of love and commitment, he is an adult who married and had children - he made a legal commitment to you and is legally and morally obligated towards his kids.
I am sorry if any of my posts have been in the LTB vein, but I really would advise you asking him for some space and spending time with really , really good friends so that you can take stock and decide whether, given his obvious diffidence towards your beautiful DCs, continuing the marriage for their sake is actually in their interests? I infer that this, really, is what you are doing.
There are some fabulous books on raising children positively after separation and divorce and there are organisations like Gingerbread and FamilyLives.org.uk who you could call to ask for counselling and advice. Speak to close family and even closer friends and establish if you would have a support network if you chose to do this alone, because that is what you need to know - that you are NOT alone, that you have people at your back who value you and want you to be happy too.
And, please do consult a lawyer to establish if there is a way to be awarded the house and enough financial support to manage until the youngest is 18 and while you work out how to get back into work - be that by training for a new career, refreshing out of date qualifications etc - and develop a plan that helps you personally get back on track with ‘self actualisation’ so that you feel stronger, build your self-esteem, make new friends and model recovery from this in a way that inspires and reassures your kids.
You are reeling at the moment, but you can bounce back from this IF you decide that actually you want a future that does not include your DH. You sound like an incredibly kind, considerate and caring person and mother. He hasn’t deserved you. And you certainly don’t deserve this.