Your unhappiness may not really be about money. You should have an honest talk with him about what the disparity means to both of you
I am a divorced woman in my 50s and for the past four years I have been in a long-distance relationship with a kind and considerate man. He runs his own business and visits me for extended periods; we spent most of 2020 together at my house. He is helpful with chores, and was very supportive of me through an intense work-from-home period.
Material wealth is not a priority for me. Having a good income myself, I don’t need to consider my partner’s income. I earn significantly more than him and I have always been clear that my main priorities are building a pension and supporting my children, who are now at university.