I've been following this closely Mo your DH sounds exactly like my financially abusive husband, who I finally left last year. Even down to the detail of him buying a sports car whilst I am struggling pay for groceries!
Just wanted to say - please don't blame yourself for not realising or seeing the warning signs. If you are a decent person inside you give people chances and don't judge too harshly. We did this, and our Hs took full advantage of this. The erosion of your self esteem comes very slowly and subtly, and before you know it, you are at the very bottom of the pit.
I got to the stage where I was paying my salary into Hs account (around £4-5,000 per month) and he paid me a small allowance each month (£850). This money paid for food, clothes, heating, holidays, nursery and school costs etc for our 3 young children.
He pocketed the remainder of my earnings as I was so bad with money and he was a financial wizard apparently.
I never questioned this. I was so brow beaten and manipulated I thought he knew best.
It's only now I am out I realise how fucked up my marriage really was. You will be the same. You are gathering strength and whilst blaming yourself is part of the journey is really like to give you my hand and say it's not your fault and you are not alone in this. I'm rooting for you. You will do this, and you will be fine. Go Mo! 