OP, do your research on your financial situation post split and also try to work on the marriage / get your DH into some counselling.
I have done both of these. The marriage isn't going to improve. We've had counselling, I communicate as best as I can. Anything even slightly critical of him is shot down "I'm sick of you speaking to me like this all the time", "Why are you so acidic towards me?" He has no interest in me. Evenings, once I've done bedtime (on my own, every night) are spent with him.silent, scrolling through his phone.
I have looked at the financials. I know about child benefit, and cms, and local housing, and wrap around care. I cannot do it here or within 25 miles of here, probably further. I could do it in my home town, where my mum would provide wrap around care some days, housing is massively cheaper, and the commute would be far shorter. I can't do it here.
I've asked the question how bad would it be to move away. I've had clear, unequivocal answers that it would be selfish and my children would hate me, so that's the question answered. I won't be going anywhere.