Why is my husband making such a big deal about money?

I make $7/hr more than him and get bonuses, everytime we go out he never lets me pay or at least let us take turns. I have never made it an issue about what he makes or what I make. I was even willing to combine our income to 1 so we can both just pay our bills no matter what it is. He has never asked me for money. Everything we do he pays his part even for half of my mortgage and the utility bills. He says he is uncomfortable combining income since he doesn't make nearly as much as me. We are married now I don't care about what's his and what's mine. Has anyone had his issue?

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