My ex years ago was on £60k to my £24k, I was struggling to keep on my house on after splitting with Ex-H, which had a £160k mortgage, to my boyfriend's £23k mortgage.
He never officially moved in, but due to us living 15 miles apart and me having a bigger house and two dogs, he spent more time at mine than me at his.
Admittedly, he could be generous when it came to socialising, he liked the finer things in life, wore designer clothes, love liked nice meals, drove a classic Porsche and I obviously couldn't afford to dine out, or go for fancy cocktails to the extent he liked to, so he'd pick up the tab 2/3 of the time so as to not miss out.
But when back at mine, I ended up paying for food shopping for both of us.
After a while he pretty much lived with me and his job enabled him to work from home as and when he pleased.
Rather than paying to commute to Canary Wharf, working from home saved him a lot of money on trains and he often only went into the office twice a week. The rest of the time, I'm at work and he's working from home, from my house.
Before long, my utility bills and shopping bills really started to increase. I was starting to struggle and he never offered me a bean. So I asked him to start contributing financially. He said he shouldn't have to, as he still had a mortgage to pay!
His mortgage was less than £280 a month to my £700 and inevitably his utility bills dropped massively as he was never at his house. Plus he was saving a lot on train fares as when he DID go to the office, my house was nearly 20 miles closer to London.
After lots of heated discussion, he started to give me £300 a month from his £2k disposable income, but begrudgingly so. You could see his face contort and mouth gnash as he handed over the money to me. He resented it massively.
He kept 'forgetting' to set up a standing order, even when I asked him to do so as some months he'd 'forget' to give me any money, which resulted in me having to constantly ask, making me feel like I was begging him for money. I told him as much that it made me feel like shit have to constantly ask him for the cash.
The salt in the wound was getting in from work most nights to find him in his PJs still at gone 5pm, sat on the sofa, laptop on his knees, drinking rum cocktails(!), with every light on and the TV blaring.
I ended up ending it. But we did limp on for three years! I'm older and wiser now, and in a much better paid job. My DP earns £28k less than me, but I only charge him £400 towards bills and take the lion's share of bills, pay for holidays and 2/3 of socialising, mainly as I'm able to and as he's generous and we don't tend to view our money as HIS and MINE. It's OURS and we've never fallen out, especially not over money.