Household expenses should paid according to income. If he makes 20% more than you it should be split 70%-30%. That way is much more fair than a 50-50 split when there is a sizeable difference in income.
I saw my mother and stepfather have problems when they were splitting 50/50 because he made almost twice as much as her so after bills, her check was spent and she had to ask him for any spending money. Once they sat down and worked out a better payment plan, they have been much happier
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