You earn 120k and squabbling about wether he earns 45k or 55k?
It's odd he cant afford Bill's OR to do anything else. How big is the rent or mortgage?
And what sort of things do you pay for.
I am a higher earner and dp earns substainally less than your dp. I cant imagine squabbling and not believing what he says. ..yes I do pay for things. Because sometimes I want to do expensive things.
That said, we still live in the house I owned when I was earning around 30k. So the mortgage is low.
If I wanted to live in a house with a huge mortgage, I wouldn't expect him to pay half of that. I would have my larger contribution recognised, like it is in the house we have now.
I get wanting to protect yourself financially. However, if you dont trust him this relationship is going nowhere.
Theres so much detail that's missing to judge wether you or him are the problem. It could be that you need to be with someone who earns similar to you, or will always feel resentful. Or it could be that he is hiding money.
Even on 40k how can he not afford half of Bill's or pretty much anything else?